Theory of Molecular Volumes. 453 



The observed volume of Di-amylene C 10 H 20 

 n (CH 3 ) 2 .CH.CH — CH 2 



CH 2 — CH.CH.(CH 3 ) 2 



is 211*8. 



M.Y. C 10 H 20 211-8 



2A.V 220-0(2x110) 



A -8-2 



This gives us a direct and independent value of the con- 

 traction for D 4 . Numerous compounds not pure hydro- 

 carbons containing the Q s ring have been directly determined, 

 and the result is to verify the value here given. They are 

 Thiophene, Furfurol, &c. 



We have thus : — 



W 18. Trimethylene lII 3 A - 5'3 



24. Tetramethylene ... D 4 A - 8*6 



30. Pentamethylene ... Q, A -12'3 



36. Hexamethylene ... D 6 A — 16*1 



42. Heptamethylene... D 7 A -20*16 



48. Octamethylene ... □„ A -24*0 



Aromatic Compounds (continued). 



Naphthalene, C 10 H 8 . 



P tt rT T B.P. 217°-1, M.V. 0-8674 



/ H \ /\ M.P.79°. 

 CH CH CH 



f V C 10 H 8 ... 48x3-70 = 177-6 



CH C CH Observed 147-2 



CH CH A for double Ring ... -30-4 



