Gives the mean diurnal variation for the whole year at a number of stations arranged in order of latitude, the mean from the 24 hourly values being taken as loo.
There is a good deal of variation in the colour of the fur, the prevailing tint being grey.
The diurnal variation showed only a single maximum and minimum, between 5 and 6 P. M.
Stas carried out such experiments on the composition of silver chloride and of ammonium chloride, but he never found a variation of one part in 10,000 in the composition of the substances.
At Karasjok and Kremsmunster the seasonal variation in a i seems comparatively small, but at Potsdam and the Bureau Central it is as large as at Kew.
The shape mostly used is the " saddle " boiler, or some variation upon this very old pattern.
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.
Daily Variation.-The figures in Table XII.
The opening and closing of the stomata is the result of variation in the turgidity 01 their guard cells, which is immediately affected by the condition of turgidity of the cells of the epidermis contiguous to them.
- Annual Variation Potential Gradient.
Gives the annual variation of the potential gradient at a number of stations arranged according to latitude, the mean value for the whole year being taken in each case as too.
From the European data one would be disposed to conclude that [[Table Ii]].-Diurnal Variation Potential Gradient.
The two last curves in the diagram contrast the diurnal variation at Kew in potential gradient and in barometric pressure for the year as a whole.
And intended to eliminate irregular changes, but they also to some extent eliminate regular changes if the hours of maxima and minima or the character of the diurnal variation alter throughout the year.
There Seems A Fairly Well Marked Annual Variation In Ionic Contents, As The Following Figures Will Show.
There is a difficulty in reconciling observed values of the ionization with the results obtained from balloon ascents as to the variation of the potential with altitude.
[[Table Xii]].-Diurnal Variation of Thunderstorms. centages.
16' 24" 16' 16" 8 Gascoigne, from his observations, deduces the greatest variation of the apparent diameter of the sun to be 35"; according to the Connaissance des temps it amounts to 32" 3.3 These results prove the enormous advance attained in accuracy by Gascoigne, and his indisputable title to the credit of inventing the micrometer.
But with all these often opposed conditions, we find less variation than might be expected, the main and really important divergence being due to the necessity of transposition, which added a very high pitch to the primarily convenient low one.
In 1727 he gained the prize given by the Academie des Sciences for his paper "On the best manner of forming and distributing the masts of ships"; and two other prizes, one for his dissertation "On the best method of observing the altitude of stars at sea," the other for his paper "On the best method of observing the variation of the compass at sea."
Variation in resistance of the transmitter spoken into causes a variation of the pressure at the line terminals of the impedance coils, and since those terminals are common to the two circuits the variable E.M.F.
The calyptoblastic polyp of the nutritive type is very uniform in character, its tendency to variation being limited, as it were, by the enclosing hydrotheca.
An important variation is seen, in the form of the hydrotheca itself, which may come off from the main stem by a stalk, as in Obelia, or may be sessile, without a stalk, as in Sertularia.
These are discussed under the headings Heredity; Mendelism; and Variation And Selection.
This subject brings the domain of pathology, however, into touch with that of variation, and we are profoundly ignorant as to the complex of external conditions which would decide in any given case how far a variation in form would be prejudicial or otherwise to the continued existence of a species.
Annual Variation.-When observations are made at irregular hours, or at only one or two fixed hours, it is doubtful how representative they are.
Deals with the variation of thunder over longer periods.
The winds are liable to little variation; they blow from the west, often with great violence, for nine months in the year, and at other times from the north; and they moderate the summer heats, which are chiefly felt during the months of July and August, when the hot winds blow from the coast of Anatolia.
One important variation, however, was a clause in the bill of rights providing for the abolition of slavery, Vermont being the first state in America to take such action.
Annual Variation.-Table I.
It has been the habit of biologists to use the terms variation, selection, elimination, correlation and so forth, vaguely; the new school, which has been strongly reinforced from the side of physical science, insists on quantitative measurements of the terms. When the anatomist says that one race is characterized by long heads, another by round heads, the biometricist demands numbers and percentages.