Theory of Molecular Volumes. 



743 



diminishes to a minimum at C 5 , Afterwards the curve 

 increases, but how, it is impossible to say exactly. 



Similar to the above are the curves for the Halogen deri- 

 vatives of the Paraffins &c. 



Related Series and the Effect of Symmetry. 



(a) The Aliphatic Esters. 



Some preliminary work has been done on related series, 



e. (/., the esters of the Fatty Acids R — CO . OR' studied by 



Gartenmeister and the Aliphatic Ethers by Dobriner, and 



some very significant relations have been obtained. 



One of the curves, viz. that for the Esters of Formic Acid, 

 has been shown. 



The Methyl and Ethyl Salts of the Fatty uicids. 

 Methyl. Ethyl. 



Compound. 



W. 



H.COOCII 3 ! 17 



CH 3 . COO C tf, 23 



C 2 H..COOCH, 29 



C 3 H- . COO CII 3 \ 35 



C 4 H 9 .COOCH, 41 



aH ni .COOCH., ' 47 



an, 



. COO CH. 

 COO CH, 



53 



59 



M.V. 



v/w. 



62-7 



3-68S 



83-2 



3-617 



104-6 



3-607 



1267 



3620 



1491 



3G37 



172-2 



3662 



196-2 



3702 



2201 



3732 



Compound. 



1I.C00C,H- 



CH, .COOCJJ-. 

 C 2 H 5 .COOC 2 H 5 ., 

 CJI-.COOCJL. 

 O 4 H . COO 2 1I 5 . 

 C.H ;1 .COO C 2 H 5 

 C C H 13 .COO C 2 H 5 

 C 7 H 15 . COO C 2 H 5 



W. 



23 

 29 

 35 

 41 

 47 

 53 

 59 

 65 



M.V. : V/W. 



8-1-6 

 1061 

 127-7 

 1505 

 174-5 

 197-7 

 221-9 

 245-9 



3 659 

 3-649 

 3-670 

 3-713 

 3730 

 3-761 

 3-782 



4-0 50 60 70 10 20 

 Number of H Eouii/ai c nts 



70 



It will be useful to reproduce some of the curves in order 

 to show how these various series develop. We consider 

 first the methyl and ethyl salts of the fatty acids. It can 



