82 PROCEEDINGS OP THE AMERICAN ACADEMY 



Analysis 1. — 0.1257 grin, of the substance gave 0.3951 of car- 

 bonic acid, and 0.1713 of water. 



100.00 100.859 



Analysis 2. — 0.2689 grm. of the substance gave 0.8398 of car- 

 bonic acid, and 0.3577 of water. 



100.00 99.96 



Determination of Vapor Density. 



Temperature of balance 18° 



Temperature of oil bath 236° 



Height of barometer 757.4 mm. at 17° 

 Increment of balloon 0.5743 



Capacity of balloon 249 c.c. 



Density of vapor found 5.066 



Theory €i H 20 = 4 vols. 4.843 



2. Margarylene = C n H. 2i . 

 Specific gravity, 0.7822 at 0° ; 0.7721 at 15°. 



Determination of Boiling -point. 



Observed temperature of liquid at commencement of dis- 

 tillation 192°. 5 

 Observed temperature of liquid 3 minutes later 192°. 7 



{( a a £J a u 193° 



« u u 10 u u 193°. 5 



Five minutes later the bottom of the retort ha^ become nearly 

 dry, the temperature having reached 194°. 5. The average of the 

 first four observations is 193° ; and the corrected boiling-point 

 195°. 4. A second determination, by another thermometer, gave 

 the corrected boiling-point 196°. 2; the average of the two deter- 

 minations being 195°. 8. 



