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198 On Tungsten. (Sept. 
in general a substance which, by the nature of its energy, and the 
arrangement of its molecules, is capable of combining with acids, 
and of neutralizing them. I have observed, likewise, that we ought 
to consider azote as approaching by its properties the nature of 
oxygen, chlorine, iodine, and that, like them, it may acidify a cer- 
tain class of bodies. But all acidifying substances may, as well as 
oxygen, when they combine with alkalifying substances in proper 
proportions, form salifiable bases. Of course, ammonia ought to 
be considered as a particular alkali, in which azote performs the 
function of oxygen in the other alkalies. 1 consider, in the same 
way, carbon in fatty bodies, and particularly in the margarine of 
Chevreuil, as performing the function of oxygen in the acids; and I 
consider it in alcohol as performing the function of oxygen in 
the oxides. I shall observe, that since the printing of the article in 
which I treat of hydriodic ether, 1 have ascertained the density of 
its vapour, and found that it does not coincide with that given by 
calculating on the supposition that the ether is a compound of the 
vapour of absolute alcohol and hydriodic acid. As the same thing 
holds with hydro-chloric ether, the density of which found by expe- 
riment is different from that found by calculating it as a compound 
of the vapour of absolute alcohol and hydro-chloric acid ; it appears 
to me very probable that the aleohol, which may be considered as 
composed of equal volumes of the vapour of water and olefiant gas 
condensed into one volume, changes its nature on combining with 
the acids. I hope to be able to throw light on this subject in a 
memoir on vapours, which I propose soon to publish. 
ARTICLE VI. 
Experiments on Tungsten, and its Combinations with Oxygen, Am- 
monia, and other Substances, to determine the Accuracy of pre- 
ceding Researches, and to promote our Knowledge of this Sub- 
stance. By Professor Bucholz.* 
Introduction. 
Some time has clapsed since I formed the resolution of making a 
set of experiments on tuogsten, its oxides, and their combinations, 
in order to verify the accuracy of preceding researches on this sub- 
stance, and in order to promote our knowledge of its nature and 
properties. [was in a situation to make these experiments in con- 
sequence of a considerable stock of wolfram and Scheele’s tungstic 
acid with which I was furnished, and for which I have chiefly to 
thank the goodness of my friend Dr. Haberle. ‘This resolution was 
* Translated from Schweigger’s ‘Neues Jourtial fiir Chemie und Physik, 
val, iii. p. ], 
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