282 PROCEEDINGS OF THE AMERICAN ACADEMY 



quantity, the middle one containing most of the substance, and these 

 three fractions were then analyzed with the following results : — 



I. 0.3701 gr. of the lowest fraction gave on combustion 1.1215 gr. 

 of carbonic dioxide and 0.3274 gr. of water. 

 II. 0.4331 gr. of the middle fraction gave on combustion 1.3071 gr. 



of carbonic dioxide and 0.3802 gr. of water. 

 III. 0.4795 gr. of the highest fraction gave on combustion 1.4469 gr. 

 of carbonic dioxide and 0.4153 gr. of water. 



This experiment showed that the substance was not perfectly pure, 

 since the lowest fraction contained more carbon than either of those 

 which came over at higher temperatures. Accordingly the distillation 

 at a pressure of 11-12 mm. was repeated, removing each time only a 

 very small fraction which came over first, until this small lower frac- 

 tion gave on analysis the same result as the portion left in the boiling 

 flask. This occurred after the third distillation, when the following 

 results were obtained : — 



IV. 0.3408 gr. of the small lowest fraction gave on combustion 

 1.0265 gr. of carbonic dioxide and 0.2963 gr. of water. 

 V. 0.3658 gr. of the principal fraction gave on combustion 1.1041 

 gr. of carbonic dioxide and 0.3175 gr. of water. 



Found. 



To these analyses we add another of an entirely different sample 

 of turmerol. 



VI. 0.5045 gr. of the substance gave on combustion 1.5246 gr. of 

 carbonic dioxide and 0.4375 gr. of water. 



The percentages of carbon and hydrogen obtained from the analyses 

 of pure turmerol are collected in the following table : — 



