. Annals of Philosophy. 90 M. Grotthuss on the [Feb. in sect. 14 by an empirical way very completely confirmed; for the eighth part of a hundred is 12*5 ; and our number comes out 12-63, which is so near a coincidence that we may consider the experimental and the calculated numbers to coincide. It appears also, that the view of the subject stated in a former seel ion as probable, corresponds correctly with matter of fact; for the hydrogen of the acid added to i-ths of the oxygen of the oxide gives a quantity of water amounting exactly to -tth of the whole weight of the anthrazothionhydrate. We
. Annals of Philosophy. 90 M. Grotthuss on the [Feb. in sect. 14 by an empirical way very completely confirmed; for the eighth part of a hundred is 12*5 ; and our number comes out 12-63, which is so near a coincidence that we may consider the experimental and the calculated numbers to coincide. It appears also, that the view of the subject stated in a former seel ion as probable, corresponds correctly with matter of fact; for the hydrogen of the acid added to i-ths of the oxygen of the oxide gives a quantity of water amounting exactly to -tth of the whole weight of the anthrazothionhydrate. We shall see likewise below how exactly the hydrogen of the anthrazothionic acid, derived from the same view (namely, 0*067 hydrogen in 1-510 acid), corresponds with the same constituent obtained in quite another way. Every hypothesis ceases to be a mere hypothesis when the phenomena connected with it, being subjected to mathematical calculation, correspond exactly, not only with each other, but with the hypothesis itself. It may then be considered as nothing else but a bare statement of a set of facts, and is raised to the rank of that highly scientific term—a theory. Sect. 18. Experiments to determine the Constituents of Anthra- zothionic Acid.—I got blown in a glass-house a number of small retorts, of the shape d, terminated by a long bent tube, and having a mouth, a. These retorts I find very convenient for -small chemical experiments. Through the mouth, a, of one of these retorts, I introduced a portion of anthrazothionate of potash in a crystallized state, and poured over it a concentrated solution of chlorine. Immediately the mouth, a, was shut, and the extremity of the bent tube introduced into the vessel, 6, con- taining lime water. Chemical action immediately began, and it was accelerated by applying heat below the retort, d. The pheno- mena which took place were effervescence, a considerable precipitation of sulphur in the retort, d, and the evolution of bubbles of
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