Theory of Molecular Volumes. 459 



Sulphur Intermediate. S = 22*l. 



Compound. M.V. 2 A.V. A for Eing. 



Thiophene, C 4 H 4 S 85'0 96*1 —11-1 



CH=CH 



I / 



CH = CH 



Nitrogen Intermediate. N 15*6 and also 11*0 (3H). 



Many compounds of this nature are available for study, 

 and some have had their volumes directly determined. 



K 

 Diazoacetic \\ \ 



Ester. ILCH-CC&H. B.P. 141°, d 22 ... 1'073. 



W 



Ethyl acetate, CH 3 . C0 2 . C 2 H 5 ... d '9252, d B .v. '8272, 



B.P. 77°-5, K = *53. 



By formula the volume is 122*4. 



Ethyl acetate, CH 8 . CO,, &c 106-0 



2H 7-4 



98*6 

 2N 31-2 



2 A.V 129-8 



By formula 122*4 



-7*4 



This compound has thus a simple three-membered ring 

 structure. 



In the following compounds N = 11*0 as in the amines. 



Compound. M.V. 2 A. V. A for Eing. K . 



Pyrrol, CAN 77*7 88*8 -11*1 -43 



CH = CH ° 4HlS 



CH = CH 



