OP ARTS AND SCIENCES. 



79 



Analysis* 

 Determination of Vapor Density 

 Temperature of balance 



Temperature of oil bath 

 Height of barometer 

 Increment of balloon 

 Capacity of balloon 



Density of vapor found 

 Theory -€ 8 H 18 = 4 vols. 



12° 



198° 

 777 mm. at 9° 

 0.3889 

 215.5 c.c. 



3.992 

 3.9425 



9. Octyl Iso-Htdride = C 8 H 18 . 

 Specific gravity 0.7516 at 0° ; 0.7430 at 15°. 



Determination of Boiling-point. — This experiment was con- 

 ducted in the manner described under octyl hydride, and for the 

 same reason there stated. Atmospheric pressure normal. 



Observed temperature of the liquid at commencement 



of distillation 

 Observed temperature of the liquid 10 minutes later 



a a (< FJ a a 



a 

 u 







4 

 6 



126°. 8 

 127°. 

 127°. 2 

 127°. 4 

 129°. 1 



Average boiling-point 127°. 6. 



Analysis.^ 

 Determination of Vapor Density. 



* A memorandum written by the author in pencil on the margin of his MS. 

 reads, after the word Analysis, " Not made, August, 1868." 



t A note by the author reads: "Analysis not yet made, August, 1868." 

 Another memorandum reads : " Storer and \V. [in their memoir on the Exam- 



