NEW LAW IN THERMOCHEMISTRY 



IS 



nenotherm. If, however, we subtract from the divisor of the 

 formula six units for each molecule of nitrogen set free during 

 combustion, the results will be more satisfactory, as follows : 



Mean, 13686 



That is, by a constant correction to the usual formula the regu- 

 lar constant can be made to appear, although at first sight the 

 procedure seems to be arbitrary. That the correction has defi- 

 nite significance, however, can be easily shown. 



The quadrupled equations for these compounds are, when all 

 substances are gaseous. 



For CNH, 4.« + 2_y + 2w — 5z — 4r = 613634 



For CjNj, 8a; + 4W — 8z — 4^ = 1038480 



For C2H3N, 8* + 6^ + 2w — \\z — 4^ = 1 186022 



For C3H5N, 12a; + loj + 2w — 17^ — 4^ = 1781570 



Now, using the assigned values for a% j, z^ and tv we can eval- 

 uate r, and so obtain the subjoined figures : 



These quantities are not simply and directly proportional to the 

 number of atomic linkings in the several molecules, and still a 

 regularity exists of an order hitherto unnoted in this memoir. 

 The unions C— C, C — H, etc., in the series so far studied, 

 have each the value of two henotherms, and so also has the 

 union C — N in the amines. But the union C — N in the cyan- 

 ides has a different value, apparently of five henotherms, and 

 when that is taken into account the quantities in the foregoing 

 table become rational. Thus in CNH there are two atomic 

 unions, one of two and one of five henotherms, and the sum is 

 seven henotherms, the quantity found. In C3H.N there are seven 

 ordinary unions and one of the cyanogen type, (7 X 2) -f 5 = 19. 



