OF ARTS AND SCIENCES. 83 



Analysis 1. — 0.197 grm. of the substance gave 0.6183 of car- 

 bonic acid, and 0.2624 of water. 



Calculated. Found. 



Carbon €„ 132 85.71 85.60 



Hydrogen H 22 22 14.29 14.80 



100.00 100.40 



Analysis 2. — 0.1997 grm. of the substance gave 0.6248 of car- 

 bonic acid, and 0.2633 of water. 



100.00 99.98 



Determination of Vapor Density. 



Temperature of balance 14°. 5 



Temperature of oil bath 250° 



Height of barometer 767 mm. at 13 



o 



Increment of balloon 0.6227 



Capacity of balloon 247.5 c.c. 



Density of vapor found 5.480 



Theory € n H 22 = 4 vols. 5.327 



3. Laurylene = C 12 H 24 . 



Specific gravity 0.7905 at 0° ; 0.7804 at 15°. 



1. Determination of Boiling-point. — By the thermometer 

 employed, water boiled at 100°. 5. 



Observed temperature of the liquid at commencement of 



distillation 212° 



Observed temperature of the liquid 16 minutes later 212°. 3 

 a u a 9 a (i 212°. 7 



<( (( u 4 a a 213° 



Three minutes later the boiling-temperature was 214°, having 

 distilled nearly to dryness. The average of the first five observa- 

 tions is 212°. 5. Deducting the error of the thermometer, 0°.5, 

 and making the usual corrections for pressure and the upper column 

 of mercury, the corrected boiling-point is found to be 216°. 8. 



