Theory 0/ Molecular Volume*. 



749 



The curves form a system, which is strikingly regular. 

 They should be similar to the curves derived from a gradual 

 increase in the complexity of the radicles in the salts of 

 formic, acetic, &c, acids. 



The methyl curve is exceedingly like the curve for the 

 silts of formic acid, but the others are different. 



The Effect of Symmetry. 



It is noted that there is a remarkable distinction to be 

 drawn between the first member in each series (the sym- 

 metrical compound) for which 



R—R'-O, 



and the ones distinguished by the relation 



R— R' = CH 2 (asymmetrical). 

 Thus in the triplet 



C 3 H 4 — 0— 0,H 9 C 3 H 7 — ~C 3 H 7 C 3 H 7 — 0— 4 H 

 V/W... 3-665 3-689 3*686 



the first and second are different, although isomeric ; the 

 second and third similar in value, although of different 

 complexity. 



Volumes of the Ethers. 



Symmetrical. 





Unsymmetrical. 



W. Compound. 



M.V. 



V/W. 



w. 



Compound. ' M.V. 



V, \v. 



17 i CHo.O.CH, 



62-56 



3-680 



_ 





20 C.JL . . C.JT-, 



106-2 



3-664 



23 



CH 3 .O.C 2 H 5 S4-0 



3-652 



41 J C,H 7 .O.C,H 7 



151-27 



3-680 



3~> 



C 2 H 5 .CC 3 H 7 ... 12808 



3-659 



53 C,H, ) .O.C 1 IT, l 



107-72 



3-730 



47 



C 3 H 7 .O.C 4 H n ... 173-25 



3-686 



65 C-H n .O.C-H n ... 



[246-28] 



3-780 



50 



C L H, .O.C,H u ... [220-35] 



3'733 



77 ! C H 13 .O.C G H ]3 ... 



[297-76] 



3-867 



71 



C-H 1] .O.C ( ,Il li ... [260-44] 



3-705 



80 j C 7 H 15 .O.C 7 H H ... 



35342 



3070 



83 



C H ;7 .O.C 7 H 15 ... [321-21] 



3-870 



1 







95 



C.ir n .O.c\H 1T ... [377-60] 



3-975 



Phil. Mag. S. 6. Vol. 27. No. 160. April 191-4 3 D 



