Dalton himself made many analyses with the purpose of establishing his views, but his skill as an analyst was not very great.
Examples of analyses treated in this manner are furnished in the last column of Table I., from which it will be seen that the nearest approach to pure carbon is furnished by anthracite, which contains above 90%.
The constancy of composition shown by repeated analyses of atmospheric air led to the view that it was a chemical compound of nitrogen and oxygen; but there was no experimental confirmation of this idea, and all observations tended to the view that it is simply a mechanical mixture.
He analyses significant stylistic peculiarities such as occur, e.g., in Isaiah xxiv.-xxvii.
But on account of experimental errors in weighing and measuring, and through loss of material in the transfer of substances from one vessel to another, such analyses are rarely trustworthy to more than one part in about Soo; so that small changes in weight consequent on the chemical change could not with certainty be proved or disproved.
He carefully analyses the principles of sound historical method and the essentials of a trustworthy historical record.
With a brilliant subtlety Bradley analyses the various types of judgment in his own way, with results that must be taken into account by all subsequent logicians of this type.
The analyses published in this work show that nearly all the widely advertised secret remedies contain only well-known and inexpensive drugs.
This office he actually held for the long period of forty-two years; and it was in this official capacity that he wrote the Histoire du renouvellement del' Academie des Sciences (Paris, 3 vols., 1708, 1717, 1722) containing extracts and analyses of the proceedings, and also the -loges of the members, written with great simplicity and delicacy.
Special glasses have therefore been produced by Tonnelot in France and at the Jena glassworks in Germany expressly for the manufacture of thermometers for accurate physical measurements; the analyses of these are shown in Table III.
Below are given examples of the analyses of a poor sandy soil and an ordinary loam: - Since the dry weight of the first foot of soil over an acre is about 4,000,000 lb the poor sandy soil contains within it: Nitrogen.
Since the earliest quantitative analyses of sea-water were made by Lavoisier in 1772, Bergman in 177 4, Vogel in 1813 and Marcet in 1819 the view has been held that the salts are present in sea-water in the form in which they are deposited when the water is evaporated.
The analyses of modern chemists have now revealed the existence of 32 out of the 80 known elements as existing dissolved in sea-water, and it is scarcely too much to say that the remaining elements also exist in minute traces which the available methods of analysis as yet fail to disclose.
Stahler, who obtained the value 39.114 from analyses of the chloride, and by Richards and E.
Soc., 1906, 28, p. 1360), by analyses of the chloride and bromide, obtained 54.96 (0 = 16).
Analyses the classes of accident comprised in items, 3 and 6 of Table X.
Included in this group are some rocks which are more properly to be regarded as vitreous forms of trachyte than as glassy rhyolites (Iceland), but except by chemical analyses they cannot be separated.
The following are typical analyses: The raw materials for the production of plate-glass are chosen.
As Marcet had foreshadowed from the analysis of 14 samples in 1819, the larger series of exact analyses proved that the variations in the proportion of individual salts to the total salts are very small, and all analyses since Dittmar's have confirmed this result.
Regnault, from analyses of the air of Paris, obtained a variation of 20 999 to 20 913; country air varied from 20.903 to 21.000; while air taken from over the sea showed an extreme variation of 20 940 to 20 850.
The following analyses (Rayleigh, Phil.
P. 721) obtained the values 9.113 from analyses of beryllium acetonyl-acetate and beryllium basic acetate.
The quantity of these materials is so small that analyses of Keene's cement show it to be almost pure anhydrous calcium sulphate, and make it difficult to explain what, if any, influence these minute amounts of alum and the like can exert on the setting of the cement.
Kriiss and Nilson derived the value 230.7 (H = I) from analyses of the carefully purified sulphate.
Such analyses, which do not always admit of great accuracy, have been confirmed by a few carefully planned experiments in which two components were brought together under very varied conditions, and the resulting compound analysed.
The average of a large number of analyses of Upland cotton seed gives the following figures for its fertilizing constituents: - Nitrogen, 3.07%; phosphoric acid, 1.02%; potash, 1.17%; besides small amounts of lime, magnesia and other valuable but less important ingredients.
The chemical composition of typical obsidians is shown by the following analyses Obsidian, when broken, shows a conchoidal fracture, like that of glass, and yields sharp-edged fragments, which have been used in many localities as arrow-points, spear-heads, knives and razors.
(3) Marti (1904) abandons the attempt to explain the prophecy as a unity, and analyses it into three elements, viz.
Most of the material termed " sand " in such analyses consists of particles ranging in diameter from .5 to.
In the ordinary chemical analyses of the soil determinations are made of the nitrogen and various carbonates present as well as of the amount of phosphoric acid, potash, soda, magnesia and other components soluble in strong hydrochloric acid.
Analyses of this character would appear to indicate the permanent productive capacity of the soil rather than its immediate power of growing a crop.
The results of many analyses show that the capacity of soils for moisture increases with the amount of organic substances present; decomposition appears to be most active when the moisture is about 4%, but can continue when it is as low as 2%, while it appears to be retarded by any excess over 4%.
The following analyses of upper leaves made at the Connecticut state station, and recorded in Report No.
While professor of morals at Leipzig, Otto Mencke planned the Acta eruditorum, with a view to make known, by means of analyses, extracts and reviews, the new works produced throughout Europe.
Kriiss worked with the same salt, and obtained the value 195.65; while Mallet, by analyses of gold chloride and bromide, and potassium auribromide, obtained the value 195.77.
These consist of galactin and lactochrome, substances peculiar to milk, discovered by Winter Blyth, with certain animal principles such as leucin, pepton, kreatin, tyrosin, &c. The salts in milk consist, according to the average of numerous analyses by Fleischmann, of the following Milk thus is not to be regarded as a definite chemical compound nor even as a mixture of bodies in fixed and invariable proportions.
Chemical analyses made by Mr F.
It often happens that analyses of brown iron ores reveal a larger proportion of water than required by the typical formula of limonite, and hence new species have been recognized.
More attention seems to have been given to the matter in the United States of America and in Germany and Russia than in England, but the infinite variety of samples known to the commercial expert, and the impossibility of standardizing those in such a manner as to make readily recognizable what the chemist has treated, renders most of the recorded analyses of uncertain value.
One reason may be that analyses are generally made of tea liquors produced by distilled water, which is the very worst possible from the point of view of the commercial expert or in domestic usage.
There he made analyses of phosphates and phosphites, arsenates and arsenites, confirming the conclusions of J.
The composition of typical samples of chalk and clay is shown in the following analyses: These materials are mixed in the proportion of about 3 :Iby weight so that the dried mixture contains approximately 75% of calcium carbonate, the balance being clay.
Analyses of the two classes of hydraulic lime are as follows: Hydraulic lime contains a good deal of uncombined lime, and has to be slaked before it is used as a cement.
The first of these, casting is chiefly adapted for bronze, or ' Analyses of the iron of prehistoric weapons have brought to light the interesting fact that many of these earliest specimens of iron manufacture contain a considerable percentage of nickel.
Berzelius found 235.5; Delafontaine, 229.7; Cleve, 232.6 by analyses of the sulphate, and 232.2 by analyses of the oxalate.
But both these unnatural forms, which are certainly not analyses of any conscious process of categorical reasoning, break down at once, because they cannot explain those moods in the third figure, e.g.
The effect of the two processes on the purity of the market lead is clearly shown by the two following analyses by Hampe, which represent lead from Lautenthal in the Harz Mountains, where the Parkes process replaced that of Pattinson, the ores and smelting process remaining practically the same: - It is absolutely necessary for the success of the Parkes process that the zinc and lead should contain only a small amount of impurity.
Many attempts have been made to correlate the results of the analyses of a soil with its known cropping power, but there is yet much to be learnt in regard to these matters.
The most numerous analyses have been carried out by Forchhammer, who dealt with 150 samples, and Dittmar, who made complete analyses of 77 samples obtained on the" Challenger"expedition.
Cavendish made many analyses: from more than soo determinations of air in winter and summer, in wet and clear weather, and in town and country, he discerned the mean composition of the atmosphere to be, oxygen 20 833% and nitrogen 79.167% The same experimenter noticed the presence of an inert gas, in very minute amount; this gas, afterwards investigated by Rayleigh and Ramsay, is now named argon.
The following analyses show their general composition: An artificial product which serves perfectly as a pozzuolana is granulated blast-furnace slag.
The Commentaries of Averroes fall under three heads: - the larger commentaries, in which a paragraph is quoted at large, and its clauses expounded one by one; the medium commentaries, which cite only the first words of a section; and the paraphrases or analyses, treatises on the subjects of the Aristotelian books.
His analyses were both chemical and bacteriological, and his dissatisfaction with the processes in vogue for the former at the time of his appointment caused him to spend two years in devising new and more accurate methods.
Eldridge in California Genealogical Society (1901); elaborate bibliographies in Bancroft with analyses and appreciations of many works.
Cantor's histories of mathematics, and more elaborate analyses are those of Nesselmann (Die Algebra der Griechen, Berlin, 1842) and G.
So much, indeed, does the character of the herbage vary from plot to plot that the effect may fairly be described as kaleidoscopic. Repeated analyses have shown how greatly both the botanical constitution and the chemical composition of the mixed herbage vary according to the description of manure applied.
The elementary composition of sugar and alcohol was fixed in 1815 by analyses made by GayLussac, Thenard and de Saussure.
He was an active worker in physiological chemistry, and carried out many analyses of the products of living organisms, among them being one of the gastric juice which, at the end of 1823, resulted in the notable discovery that the acid contents of the stomach contain hydrochloric acid which is separable by distillation.