DESTRUCTIVE DISTILLATION OF ANIMAL SUBSTANCES. 



209 



Weight of vapour bulb empty, . 22-2530 



full of vapour, 22-4806 



Hence 



Temperature at weighing, 

 Barometer, ..... 



13°5 



753 mm. 



Volume of bulb, .... 



127-1 C.C. 



Residual air, .... 



0-2 C.C. 



Weight of bulb and vapour, 



22-4806 



air displaced, 



0-1552 



Weight of bulb and vapour in vacuo, 

 bulb, .... 



22-6358 

 22-5230 





0-3828 



Residual air, .... 



0-0003 



Weight of vapour, 



Weight of air thermometer, . 



0-3825 



264 grains 



partly full of mercury, 

 Barometer 753 — 675 . 



14391 

 685-5 mm. 



Temperature, 



Air thermometer full of mercury, 



17°-5 C. 

 26930 



Hence 



and 



Weight of mercury partially filling bulb, 14127 

 completely, . 26666 



26666 - 14127 = 12539. 



Now, we have here in the formula 



whence 

 Now 



and 

 and 



W(l + let) = w.- x l + at 

 K ' H X 1 + at' 



W = 26666 

 w = 12539 

 H = 753 

 h = 685-5 

 a = 0-00366 

 k = 0-00003 

 t' = 17°'5 



t = 414°-4 Cent. 

 127'1 - 0-5 = 126-5 * 



126-5 



1 + 4l4°-4 x 0-00366 X 760 X 



753 1-29366 



1000 



= 0646 , 



0-3825 



= 5-92 . 



00646 



The formula C 10 H 10 N 2 requires 546. This result is as close as could be expected 

 under the circumstances, and proves that the base must be formed by the com- 



* 0*5 is the volume of the residual air at 414°. 

 VOL. XXV. PART I. 3 H 



