372 PROCEEDINGS OF THE AMERICAN ACADEMY § 5 



phur atoms are attached only on one side, in the others 

 there are two points of attachment, indicating clearly 

 for each atom a loss of 2% of the maximum value 

 of the latent heat, that is, a principal ratio of 0.90; 

 but the first case indicates for two atoms the value 0.95 

 and for one the value 0.90, giving an average value any- 

 where from 0.91 to 0.94 according as we take the numbers 

 of atoms, merely, or the atomic weights into account. 



In the same wa}^, for turpentine, assuming the graphical 

 symbol 



H 



H — C — H 



I 

 // — C -- H 



H — C — II 



C 



//\ 



H — C C < 



II — C C < 



w / 



\\/ 



C 



II 

 II 

 II 



H — C — II 



II 



or some different symbol, more or less condensed,* we 

 have for the principal ratio a set of values from 0.83 

 to 0.90, and for ether 



H II II II 



II II, 



// — 6' — C — O — C — C — II 

 I I II 



// // // // 



we have values from 0.84 to 0.91. 



* See Beilstein, Vol. II., page 1769. 



