gives some data as to the variability of thunder from year to year.
But the causes and conditions of variation have yet to be thoroughly explored; and the importance of natural selection will not be impaired, even if further inquiries should prove that variability is definite, and is determined in certain directions rather than in others, by conditions inherent in that which varies.
The Aristotelian would find no difficulty in such a variability; it is only the disciple of Dalton to whom it seems impossible.
The result is a variability of terrestrial latitudes generally.
In both cases no extraneous cause can be assigned; the period seems to be inherent in the star itself and not to be determined by the revolution of a satellite (no variability of the line-of-sight motion of Mira has been found, so that it is probably not accompanied by any large companion).
The variability in form and function of the second maxillae is sufficiently shown by the fact that G.
measure of the individual variability of the organism which produces them.
A transformation which is sometimes rapid, sometimes slow, but always continuous, is wrought by the reciprocal action of the innate variability of plants and of the variability of the external factors.
It was difficult to be sure as to the variations in the actual number of fish caught, but it was easy to show that there was a real variability in the yield of cod-liver oil (an important product of the fishery).
Natural clays, even when most pure, show a considerable range of composition, and hence cannot be regarded as consisting of a single mineral; clay is a rock, and has that variability which characterizes all rocks.
is a large tree remarkable for the variability in the shape of its leaves, which are linear in young trees and vigorous shoots, and broad and ovate on older branches.
When we consider, however, the great variability in those surroundings and the consequent changes a plant must encounter, it appears obvious that interaction ~nd adjustment between the plant and its environment must be constant and well balanced.
The conclusions deducible from their anthropological features - apart from the general difficulty of arriving at safe conclusions on this ground alone, on account of the variability of the ethnological type under various conditions of life - are also rather indefinite.
The extreme variability in the amount of rainfall is remarkable.'
In the latter case the organization seems to become plastic, and we have much fluctuating variability.
He proclaimed the variability of species in opposition to the views of Linnaeus as to their fixity, and moreover supposed that this variability arose in part by degradation.
Later still Hjort showed that the study of the variability in the productivity of a fishery is always a complex matter - far more so than was formerly supposed.
Thus the field of disease arising not from essential defect in the body, but from external contingencies, is vastly enlarging; while on the other hand the great variability of individuals in susceptibility explains the very variable results of such extrinsic causes.
In modern thermometry instruments of extreme accuracy are required, and researches have been made, especially in Germany and France, to ascertain the causes of variability in mercurial thermometers, and how such variability is to be removed or reduced.
Other tests show variability in burning quality, elasticity of leaf, texture, taste, &c. The United States Department of Agriculture has closely investigated this important question and the results attained are brought together by Messrs H.
Both in size and form considerable variability is displayed, the species of Holochilus being some of the largest, while the common white-footed mouse (Eligmodon leucopus) of North America is one of the smaller forms. Some kinds, such as Oryzomys and Peromyscus have long, rat-like tails, while others, like Acodon, are short-tailed and more volelike in appearance.
Deperet notes that the genus Neumayria, an ammonite of the Kimmeridgian, suddenly branches out into an explosion" of forms. Deperet also observes the contrast between periods of quiescence and limited variability and periods of sudden efflorescence.
Among the ammonites the loss of power to coil the shell is one feature of racial old age, and in others old age is accompanied by closer coiling and loss of surface ornamentation, such as spines, ribs, spirals; while in other forms an arresting of variability precedes extinction.
Brocchi and Daniel Rosa (1899) have developed the hypothesis of the progressive reduction of variability.
Such decline is by no means a universal law of life, however, because among many of the continental vertebrates at least we observe extinctions repeatedly occurring during the expression of maximum variability.
Internal causes of extinction are to be found in exaggeration of body size, in the hypertrophy or over-specialization of certain organs, in the irreversibility of evolution, and possibly, although this has not been demonstrated, in a progressive reduction of variability.
The tongue presents little variability in length, being short and compressed, with a blunt tip, which is never protruded beyond the incisors.
To explain this great variability of spectroscopic effects we may either adopt the view that molecular aggregates of semi-stable nature may be found in vacuum tubes, or that a molecule may gain or lose one or more additional electrons and thus form new vibrating systems. It seemed that an important guide to clear our notions in this direction could be obtained through the discovery of J.
This curious variability, deserving more attention than it has yet received, only occurs in the outer feathers of the series, which are narrow in form and extremely stiff, there being always 10 in the middle of ordinary breadth.
It is to the different characters of the stations they occupy with respect to exposure, moisture, &c., that the variability observed in many types of lichens is to be attributed.
This has been more especially the case when the auroral light has been of a diffused character, showing only minor variability.
He insisted that the great powers of increase of all organisms led to a tremendous struggle for existence, and that variability extended to every part and organ of every organism; that the variability was large in amount in proportion to the size of the part affected, and occurred in a considerable proportion of the individuals of those large and dominant species which might be supposed to be breaking up into new species.
The variability of structures which are repeated in the body of the same individual (serial homologues) has been studied by Pearson and his pupils with important results.
We may therefore conclude that for large classes of characters, both animal and vegetable, the variability of an individual, as measured by the standard deviation of its undifferentiated but repeated organs, is a constant fraction of the variability of its race, as measured by the standard deviation of the corresponding series of organs produced by all the individuals of its race.
The evidence that the correlation between sexually produced brethren is the same as that existing between the asexually repeated organs on an individual body renders it impossible to accept Weismann's view that one of the results produced by the differentiation of animals and plants into two sexes is an increase in the variability of their offspring.
The question of a possible variability in the length of the day is one of fundamental importance.
There is some over-lapping of these two classes as regards length of period, and it is doubtful in which class some stars, whose periods are between io days and 150 days, should be placed; but the two classes are quite distinct physically, and the variability depends on entirely different causes.
The variability of Algol ((3 Persei) was discovered in 1783 by John Goodricke (1764-1786), but, judging from its name, which signifies ' ` the demon," it seems possible that its peculiarity may have been known to the ancient astronomers.
Ever since the variability of Algol was observed it was suspected to be due to a partial eclipse of the star by a dark body nearly as large as itself revolving round it; but the explanation remained merely a surmise until K.
The greatest variability in temperature conditions in the state occurs in the Blue Ridge, Newer Appalachian Provinces, where the most rugged and variable topography is likewise found.
Owing to its variability in this respect, and to its insolubility, certain other salts have largely replaced the sulphate in modern medicine.
These illustrations of the enormous variability of discharge serve to explain what is popularly so little understood, namely, the advantage which riparian owners, or other persons Comperei nterested in a given stream, may derive from works cation water.
The most plausible explanation is that, like the discrepancy in the secular acceleration, the observed deviation is only apparent, and arises from slow fluctuations in the earth's rotation, and therefore in our measure of time produced by the motion of great masses of polar ice and the variability of the amount of snowfall on the great continents.
This means there is a greater variability between individual plants which makes the species more adaptable to change.
NASA's ESE research focuses on the changes and variability in the Earth system, including atmospheric, oceanic, and geodetic areas.
climate variability in the vicinity of the Antarctic Peninsula.
How does the variability of the Sun affect the earth's climate?
diurnal variability of solar input, or the annual or seasonal variation of heating.
This annual variability is especially evident at the southern end, where easterly and south-easterly winter storms have caused severe drawdown.
Potential variability in antiemetic efficacy was examined by looking at doses.
firn cores will be analyzed in the field to see variability in snowfall.
This survey provides insights into the local variability of the surficial geology that cannot be obtained from the regional studies.
flow variability in the Scandinavian ice sheet: modeling the coupling between ice sheet flow and hydrology.
Ferritin Serum ferritin was measured by immunoassay, a method which displays wide inter-laboratory variability.
intersession variability, even for the strong visual paradigm.
ionosonde measurements on Earth provide ample data to define variability patters.
maser sources in the Galaxy and monitoring the variability of known sources.
maximal oxygen uptake by performing a heart rate variability test Polar Own Code.
In the melanomas, staining was relatively uniform, while in primary acquired melanosis there was cell-to-cell variability in the staining.
After fitting the straight line, the remaining variability about the line can be measured by the sum of squared residuals, 1070.
spatial variability was less evident for algae attached to rocks.
Note the very large standard deviations in Table 1, showing great variability.
temporal variability in the signal.
triploid salmon were found to have much greater variability in growth than fertile diploids  .
However, the range of variability in fractured vertebrae would pose a problem for a global model.
If such an array of repeated organs be chosen from the proper region of the body, within proper limits of time, in each of a large series of individuals belonging to a race, and if all the arrays so chosen be added together, a series will be formed from which the racial variability can be determined.
The variability of an array of such a table-that is, of any line or column of it-is the mean variability of pairs of leaves, each pair chosen from one tree, and having one leaf of a particular character; it may therefore be taken as a fair measure of the variability of such a tree.
From this result it follows (see Probability) that the standard deviation of the array, which we have taken as a measure of individual variability, is equal to the standard deviation of the race multiplied by V I - (2) z or by * These results cannot be accepted as final, but they are based on so many investigations of animals and plants, of such widely different kinds, that they may confidently be expected to hold for large classes of organic characters.
Among the most important structures produced in repeated series are the reproductive cells; and Pearson points out that if the variability of animals or of plants be supposed to depend upon that of the germ-cells from which they arise, then the correlation between brothers in the array produced by the same parents will give a measure of the correlation between the parental germ-cells, the determination requiring, of course, the same precautions to avoid the effects of differentiation as are necessary in the study of other repeated organs.
After a large series of measurements, involving the most varied characters of human brothers, Pearson has shown that the correlation has a value very nearly equal to z; so that the variability of human children obeys the same law as that of other repeated structures, the standard deviation of an array, produced by the same parents, having an average value equal to the standard deviation of the whole filial generation multiplied by 1 2 1 J I - (or by.
There is therefore in a large class, of cases an indication that the variability of an array of brethren, produced either sexually or asexually, is a constant fraction of the variability of the race to which the brethren belong.
Displaying great variability in the length of the tail, which is reduced to a mere tubercle in the Barbary ape, alone representing the subgenus Inuus, macaques are heavily-built monkeys, with longer muzzles than their compatriots the langurs (see PRIMATES), and large naked callosities on the buttocks.
Temporal and spatial variability was less evident for algae attached to rocks.
Spatial variability in herbicide degradation in the subsurface environment of a groundwater protection zone.
Also, the net is very tolerant of temporal variability in the signal.
Families of triploid salmon were found to have much greater variability in growth than fertile diploids [7 ].
If you are looking for scoopable litter with odor control, Arm and Hammer has effective products with some variability among the products.
A common disadvantage of wind power has been wind variability.
The newer version, which is available for both Linux and Mac, overcomes some of the hardware limitations that gamers faced in the mid-90s, expanding the game to allow for more vehicles, more variability, and more options.
In addition, this variability also hinders clinical research.
Not only is there extreme variability in symptoms among individuals with Tourette syndrome, but individuals commonly experience variability in type, frequency, and severity of symptoms over the course of their lifetime.
Renal vein thrombosis is more common in patients with nephrotic syndrome, although studies have shown high variability among these patients, with rates of 5 to 62 percent reported.
However, the RDA values are actually greater than the minimal requirement, as determined by studies on small groups of healthy human subjects, in order to accommodate the variability expected among the general population.
Other indicators of fetal well-being include short term variability (STV), which constitutes changes in the FHR from one beat to another, and long term variability (LTV), which is changes in the FHR over a long period of time.
One of the worst indications of fetal distress, however, is a tracing that shows no variability at all.
Although the milestones follow one another in roughly the same sequence, there is significant variability from child to child on when the first word is spoken and the first sentence is composed.
There is a great deal of variability in the severity of symptoms, which can range from clinically insignificant to life threatening.
The normal variability of skeletal age is about 10 percent of attained chronological age.
The fact that there are many mutations explains some of the variability of symptoms among boys with WAS.
Because of this variability, it's important to track when you ovulate so you can time intercourse appropriately.
Penreco, the company with the patent on gel wax, uses mineral oil with a very narrow flashpoint variability that is not possible to duplicate on your own.
There is a great deal of variability in the timing of engagement parties.
There is a lot of variability in the size of these flaws and their location within a stone.
Part of the variability rests with the fact that many major fast food restaurants operate as franchises, with different owners responsible for one store only.
We see therefore that while leaves, gathered in equal numbers from each of loo trees, are distributed about their mean with a standard deviation of 1.735 veins, the leaves gathered from a single tree are distributed about their mean with a standard deviation of 1.426 veins, the ratio between variability of the race and variability of the individual tree being 1 - (0-5699)1=0.822.
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