378 Additional Notice on the Fused Carbonaceous Bodies. 



fies at 60° Fahrenheit, and the hard part, called stearint^ 

 which remains solid at 100° Fahrenheit. But he had sepa- 

 rated the two substances, and re-combi.ned them in various 

 ways. Without any chemical analysis, he had compared 

 the elainc of tallow with the sweat of cattle, and found a 

 great resemblance in their sensible qualities; though the 

 latter contained a larger proportion of water and of muriate 

 of soda. From these observations he infers: that during 

 the hot part of the season, when cattle sweat profusely, such 

 a large proportion of the elaine is evacuated through their 

 skins, that the stearine is left in a much larger proportion 

 than that which is found in their tallow after the sweating 

 season has passed. 



With Mr. P.'s permission, I communicate these observa- 

 tions, in the hope that some American chemist, who has suf- 

 ficient leisure, will compare the results of an accurate analy- 

 sis of the elaine and sweat of beeves. It may throw some 

 light upon the science of animal economy, and of the prox- 

 imate principles of animal matter. 



Troy, N. Y. Jan. 13, 1823. 



16. Additional Notice on the Fused Carbonaceous Bodies. 



If melted charcoal, plumbago and anthracite do really 

 approximate towards the character of diamoad, we ought 

 to expect that, in consequence of fusion, there would be a 

 diminution of conducting power, with respect both to heat 

 and to electricity. This I find to be the fact. As soon as 

 the point of charcoal is fused by the deflagrator, the power 

 of the instrument is very much impeded by it; but as soon 

 as the melted portion is removed, the remaining charcoal 

 conducts as well as before ; and so on, for any number of 

 repetitions of (he experiment, with the same pieces of char- 

 coal. 

 The globules of melted plumbago are absolute non-conduct- 

 ors, as strictly so as the diamond. This fact is very pleasingly 

 exhibited, when a point of prepared charcoal, connected 

 with the zinc pole of the deflagrator, is made to touch a glo- 

 bule of melted plumbago, however small, still adhering to 

 a parallelopiped of plumbago, in its natural state, screwed 

 into the vi( e connected with the copper pole; not theminU" 

 test spark will pass ; but if the charcoal point be moved, 



