OP ARTS AND SCIENCES. 



77 



Analysis 2. — 0.2187 grin, of the substance gave 0.6766 of car- 

 bonic acid, and 0.3064 of water. 



100.00 



99.95 



Determination of Vapor Density. 



Temperature of balance 12°. 5 



Temperature of oil bath 134° 



Height of barometer 746 mm. at 6° 

 Increment of balloon 0.4383 



Capacity of balloon 242 c.c. 



Density of vapor found 

 Theory -€ 7 H 16 = 4 vols. 



3.547 

 3.458 



7. Heptyl Iso-Htrride = C 7 Hi 6 . 



Specific gravity 0.7299 at 0°; 0.7184 at 15°. After treatment 

 with an excess of monohydrated nitric acid, specific gravity 0.7048 

 at 16°. 



Determination of Boiling-point. 



Observed temperature of the liquid at commencement 



of distillation 96°. 6 



Observed temperature of the liquid 10 minutes later 96°. 8 



it tt tt 15 tt u 96 o 9 



" " «« 20 " " 97°. 2 



Having had occasion to leave the experiment for a few moments at 

 this juncture, on returning ten minutes later it was found that 

 the liquid had distilled to dryness. The average of the observa- 

 tions 96°. 8 and 97°. 2 is 97°. Applying the proper corrections, 

 we find the corrected boiling-point to be 98°. 1. 



After treatment of a small portion of this oil with monohydrated 

 nitric acid, its corrected boiling-point was then 97°. 85; but, as in 

 the last experiment, the quantit}' of oil operated upon was too 

 small to admit of making a very exact determination. 



