10 PROCEEDINGS OP THE AMERICAN ACADEMY 



VI. 0.3315 g. gave 1.0194 g. of C0„ and 0.3145 g. of Hp. 



VII. 0.2837 g. gave 0.8G75 g. of CO,' and 0.2604 g. of H^O. 



VIII. 0.2706 g. gave 0.8228 g. of COl and 0.2474 g. of Up. 



Lower Fraction. Higher Fractions. 



TI. VII. vni. 



Carbon 83.86 83.39 82.92 



Hydrogen 10.54 10.20 10.16 



From this it appears that the substance is essentially pure and 

 homogeneous. 



As has been stated already, the turmerol can be purified to a certain 

 extent by distillation with steam ; analysis IX. was made with a sample 

 prepared in this way, while X. was made with some of the same sample 

 after it had been distilled once under ordinary pressure. These speci- 

 mens were extracted with carbonic disulphide instead of ligroine. 



IX. 0.2260 g. gave 0.6860 g. of CO, and 0.2195 g. of H,0. 

 X. 0.2636 g. gave 0.8038 g. of CO, and 0.2546 g. of H^O. 



IX. X. 



Carbon 82.78 83.16 



Hydrogen 10.77 10.73 



The analyses unfortunately are not capable of establishing the for- 

 mula of turmerol with certainty, since the difference between the 

 members of the homologous series is very small, as is shown by the 

 following comparison : — 



Taking both the hydrogen and the carbon into consideration, our 

 results agree best with the formula CjgHgyO, as shown above in the 

 case of the mean, and a comparison of the separate analyses with the 

 calculated percentages also declares in favor of this formula. But it 

 is evident that it is impossible to decide definitely from these data in 

 favor of this formula, nor can the derivatives we have prepared from 

 the oil settle this question, as a thorough purification of these bodies 

 has proved impossible on account of their ill-defiued properties and 

 slight stability. 



We are inclined to ascribe the differences between analyses VI. and 

 VII. and VIII. to the presence of a trace of some hydrocarbon from the 

 ligroine, but did not attempt to purify the substance further, as it is 

 slightly decomposed, even by distillation, under a pressure of 60 mm. 



