100 PROCEEDINGS OP THE AMERICAN ACADEMY. 



Heptyl Thiophane. 



The fraction 74°-76°, 50mm., which proved to contain heptyl thio- 

 phane, gave as its index of refraction 1.468, corresponding to the follow- 

 ing molecular refraction : 



Calculated for C,H U 8. Found. 



40.15 40.82 



Octyl Thiophane. 



From the fraction 83°-85°, 50mm., was separated octyl thiophane. 

 Its index of refraction was found to be 1.4860, and its molecular 

 refraction : 



Calculated for C 8 Hi 6 S. Found. 



44.75 44.91 



Nonyl Thiophane. 



Nonyl thiophane was found to be the principal constituent of the 

 fraction 106°-108°, 50mm. It gave as its index of refraction 1.4746, 

 from which was calculated its molecular refraction : 



Calculated for C 3 H 18 S. Found. 



49.35 49.50 



Decyl Thiophane, Ci H 20 S. 



The index of refraction of the distillate 114°-116°, from which was 

 separated decyl thiophane, we found to be 1.4766. Its molecular refrac- 

 tion was calculated as follows : 



Calculated for C, II 20 S. Found. 



53.94 53.60 



Undecyl Thiophane. 



Undecyl thiophane was found in the fraction 130°-135°, 50mm. 

 We found its index of refraction to be 1.480, and its molecular 

 refraction : 



Calculated for C U H„ 2 S. Found. 



58.54 58.53 



