84 



PROCEEDINGS OP THE AMERICAN ACADEMY 



2. Determination of Boiling-point. — The conditions of this ex- 

 periment were the same as the last, with the exception that by the 

 thermometer employed, water boiled at 101°. 1. 



Observed temperature of the liquid at beginning of 



distillation 

 Observed temperature of the liquid 5 minutes later 



3 



a 



a 



a 



a 



5 



4 



u 

 (( 



it 



a 

 (i 



210°. 3 

 210°. 7 

 211° 

 211°. 5 

 212° 



Had distilled nearly to dryness at 212°5. Average of the six 

 observations, 211°; corrected boiling-point, 215°. 5. Average of 

 both determinations, 216°. 2. 



Analysis 1. — 0.1401 grm. of the substance gave 0.4349 of car- 

 bonic acid, and 0.1872 of water. 



100.00 



99.51 



Analysis 2. — 0.1934 grm. of the substance gave 0.608 of car- 

 bonic acid, and 0.2551 of water. 



100.00 



100.40 



Determination of Vapor Density. 



Temperature of balance 12°. 5 



Temperature of oil bath 274° 



Height of barometer 762.6 mm. at 4° 

 Increment of balloon 0.6905 



Capacity of balloon 253 c.c. 



Density of vapor found 

 Theory, Ci 2 H 24 = 4 vols. 



6.090 

 5.812 



