74 PROCEEDINGS OF THE AMERICAN ACADEMY 



3. Amtl Iso-Htdkide = C 5 H 12 . 

 Specific gravity 0.6454 at 0° ; 0.6326 at 15° ; 0.6306 at 17° 



Determination of Boiling-point. 



Observed temperature of the liquid at commencement 



of distillation 36°. 6 



Observed temperature of the liquid 38 minutes later 3(5°. 6 



" " " 20 " " 36°. 7 



" " " 10 " " 36°. 7 



Eight minutes later the liquid had all vaporized. The corrected 

 boiling-point was found to be 37°. 



Analysis. — By combustion with cupric oxide in the manner de- 

 scribed under Hydride of Amyl, 0.1666 gnu. of the substance gave 

 0.5068 of carbonic acid, and 0.2482 of water. 



100.000 99.520 



Determination of Vapor Density. 



Temperature of balance 8°. 5 



Temperature of oil bath 129° 



Height of barometer 778.8mm. at 0° 

 Increment of balloon 0.2255 



Capacity of balloon 227.5 c.c. 



Density of vapor found 2.514 



Theory € 5 H 12 = 4 vols. 2.4932 



4. Hextl Hydride — C 6 H 14 . 

 Specific gravity 0.6762 at 0° ; 0.6638 at 15°. 



Determination of Boiling-point. 



Observed temperature of the liquid at commencement 



of distillation 61°. 



Observed temperature of the liquid 1 minute later 61°. 2 



" " " 36 minutes " 61°. 2 



Five mintes later it had distilled to dryness. The temperature 

 of the boiling liquid was, therefore, absolutely constant at 61°. 2 



