978 Mr. Gervaise Le Bas on the 



Ethidene Diethyl Ether. 

 CH 3 .CH(OC 2 H 5 ) 2 . 



C 2 H 5 .0;C 2 H 5 106-1 



2 H 5 .0;C 2 H 5 106-1 



less'C 4 H 10 -96-0 



116-2 

 plus2CH 2 44-2 



SA.Y 160-4 



V 160-2 



The following compounds are noteworthy : — 



M.V. 2A.V. A. 



1,2 CH 2 Br.CH 2 Br 97*6 100'8 -3'2 



1,2 OH 2 l.CH 2 01 .. 101-3 103-3 -2'0 



1,2 CCl 3 .CO"Cl 125-5 129-1 -3-6 



OH 3 .CO"Cl 74-0 73-9 — 



1,-1 CH 3 . CH 2 . OHCl 2 111-0 111-0 — 



1.2 CH 3 . CHC1 . CH 2 C1 1079 111-0 -31 



1.3 CH 2 01 . CH 2 . CH 2 01 106-0 111-0 -50 



1.1.1 CH 3 .CC1 3 108-0 107-0 — 



1.1.2 0H o Cl.CHCl 2 103-7 107-0 -3*3 



1,1,2,2 CHC1 2 .CHC1 2 119-4 125-4 -6-0 



1,1,1,2,2 0HC1 2 .CC1 3 1382 143*8 -5-6 



The results furnished by the above investigation are ex- 

 ceedingly clear and uniform. 



(a) If a paraffin compound be substituted by a halogen or 

 other unsaturated substituent more than once, the volume of 

 the compound is normal or subject to the additive rule, 

 provided that the substituents be attached to a single C atom. 



(b) If they are distributed among several carbon atoms, 

 there are always contractions of a constitutive nature. 



It matters not how many of the H atoms of the terminal 

 C are substituted, the contractions are dependent upon the 

 number in the ft position which are substituted. 



For one substitution in the ft position the contraction is a 

 little over 3'0 units. 



For two substitutions in the ft position the contraction is 

 about 6*0 units, or nearly double the first. 



Substitutions in the 7 (1, 3) position always involve greater 

 contractions than substitutions in the ft (1, 2) position ; and 

 it is conceivable that substitutions in the & (1, 4) position 

 would result in still larger contractions. 



