78 



PROCEEDINGS OF THE AMERICAN ACADEMY 



Analysis. — 0.2073 grin, of the substance gave 0.6469 of car- 

 bonic acid, and 0.2862 of water. 



100.00 



100.45 



Determination of Vapor Density. 



Temperature of balance 17° 



Temperature of oil bath 138°. 5 



Height of barometer 763.4 mm. at 9° 

 Increment of balloon 0.4236 



Capacity of balloon 228.5 c.c. 



Density of vapor found 

 Theory -€ 7 H 16 = 4 vols. 



3.546 

 3.389 



8. Octtl Hydride = C 8 Hi 8 . 

 Specific gravity 0.7374 at 0° ; 0.7262 at 15°. 



Determination of Boiling-point. — The quantity of liquid at my 

 disposal for this experiment was considerably smaller than that 

 employed in the determinations above detailed; therefore, instead 

 of using a retort, the distillation was made from a large, long- 

 necked bulb. Since in this case the whole of the mercury was 

 situated below the cork, and surrounded by the hot ascending 

 vapors, no correction for the mercurial column is required. 



Observed temperature of the liquid at commencement 



of distillation 119°. 1 



Observed temperature of the liquid 5 minutes later 119°. 2 

 " " " 10 " " 119°. 4 



U u a 2 " " 119°. 6 



a a << 3 u u 120° 



At the latter point it had distilled nearly to dryness. This de- 

 termination was made under normal atmospheric pressure, and 

 therefore requires no correction. Taking the average of the five 

 observations, we find the boiling-point to be 119°. 5. 



