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Updated: July 12, 2025
They therefore paint with varnish as a medium, multiplying the processes of glazing with pure color so that under a number of surfaces of varnish the same chemical action may be precipitated which in the earlier art came about with but few exceptions as a happening through the simple necessary acts of preservation.
As a result of the fermentation the part of the plant which is the basis of the indigo is separated from the leaves and dissolved in the water; and as a second feature of the fermentation the soluble material is changed in its chemical nature into indigo proper. As this change occurs the characteristic blue colour is developed, and the material is rendered insoluble in water.
In the living body the chemical energy of food is directly transformed into work, without first being converted into heat. Why a horse can do more work than a one-horse-power engine is probably because his living cells can and do draw upon this molecular energy.
"Hence," finished Hawkins, dramatically, "the fuel retains its chemical integrity indefinitely, and, as it circulates automatically through the motor, the little engine will run for months at a time without a particle of attention. Is that quite clear?" "Perfectly," I lied. "All right.
He holds the mirror up to Nature, paralyzes the fleeting phantom, by chemical subtilty, on the burnished plate, and there it is fixed forever. He prepares the optical illusion of the stereoscope, so that through tiny windows we may look as into fairy-land and find sections of this magnificent world modelled in miniature. Once men imagined the earth to be a flat and limited tract.
By that it is meant that animal phosphorescence is attended, like the artificial phenomenon, by a slow chemical action, or in other words, that the phosphorescent light is due to a gradual process of oxidation. One curious circumstance has been discovered which lends still further probability to this explanation.
The necessary biological and chemical examinations for the hospital would be made in the laboratories of the Bureau of Science, which would at the same time afford every facility for the carrying on of scientific investigation by advanced students, by members of the faculty of the college and by members of the hospital staff.
Much chemical work would be required by the Bureau of Customs, which as a matter of fact later insisted upon the necessity of a "microscopical laboratory" to provide facilities for the examination of fibres, etc.
Even when the best of the chemical papers are used in the bank check the drawer of the paper may have not the slightest protection from "raising" at the hands of an expert. The manner in which the written and figure amounts on the face of the check are placed makes the material alteration of the amount easy beyond question.
These need not detain us, since the important aspect of Needham's work relevant to our purpose is his continuation of the chemical analysis of the developing embryo and its demonstration that, although Harvey might have despised the "chymists" and been contemptuous of the "mechanical, corpuscular philosophy," this system and approach was not to be denied.
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