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Updated: June 19, 2025
Ranke, the great German historian, died at the age of ninety-one, and Chevreul, the eminent chemist, at that of a hundred and two. Some English sporting characters have furnished striking examples of robust longevity. In Gilpin's "Forest Scenery" there is the story of one of these horseback heroes. Henry Hastings was the name of this old gentleman, who lived in the time of Charles the First.
Wool from Buenos Ayres, for example, contains much less than that analyzed by M. Chevreul; its amount is only 12 per cent. of the weight of the raw wool. In 1859, MM. Maumene and Rogelet patented the use of the water in which wool has been washed as a source of potash, and at present the extraction of potash from suint is practiced in France on a large scale.
M. Charles Henry, an original and remarkable spirit, occupied himself in his turn with these delicate problems by applying them directly to aesthetics, which Helmholtz and Chevreul had not thought of doing. M. Charles Henry had the idea of creating relations between this branch of science and the laws of painting.
It is far from my purpose to desire in the least to minimize the services that a Chevreul or a Kopp has performed for the history of chemistry; what I should like to draw attention to is merely that the honored fathers of the history of chemistry saw only the lower—“inferius”—and not the higher—“superius”—phase of alchemy, for example, in the Smaragdine tablet; and that they used it as the type of universal judgment in such a way that it needed a special faculty for discovery to reopen a fountain that had been choked up.
There was a man who died in Spain at the advanced age of one hundred and fifty-one, which is the most extraordinary instance from that country. It is reported that quite recently a Chinese centenarian passed the examination for the highest place in the Academy of Mandarins. Chevreul, born in 1786, at Angers, has only recently died after an active life in chemical investigation.
Ranke, the great German historian, died at the age of ninety-one, and Chevreul, the eminent chemist, at that of a hundred and two. Some English sporting characters have furnished striking examples of robust longevity. In Gilpin's "Forest Scenery" there is the story of one of these horseback heroes. Henry Hastings was the name of this old gentleman, who lived in the time of Charles the First.
The flourishing of Impressionism coincided, as a matter of fact, with certain scientific labours concerning optics. Helmholtz had just published his works on the perception of colours and sounds by means of waves. Chevreul had continued on this path by establishing his beautiful theories on the analysis of the solar spectrum.
In 1828, M. Chevreul, who is still alive in Paris, although nearly a century old, published an analysis of merino wool. It consisted of: It is easily seen that suint forms a very important constituent of raw wool. Its proportion varies, of course, according to the nature of the pasture on which the sheep are fed, the climate, etc.
With a combination of blue and green for instance, a yellow shade would appear in the green and a red in the blue. Such a result fails to satisfy the demand, already touched on, for purity and homogeneity of color, that is, for unimpeded seeing of color. <1> Chevreul, De la Loi du Contraste Simultane des Couleurs. E.S. Banker, op. Cit.
I was told that the very best book was by Chevreul, which had tinted illustrations, chromatic scales, and all that could be desired. Quite true, all of it; but for me it contained nothing. There was a good deal about assorted wools, but nothing about leaves; nothing by which I could tell you the difference between the light scarlet of one poppy and the deep purple-scarlet of another species.
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