Br. CH 2 



i 



CH-Br 

 1 !! 



1 



(I) CH-Br 



I !! 



(H) CH - Br 

 1 



I !! 

 CH-OH. 



1 



GH-CH 2 



Contraction —3-1 



/3 

 -3-1 



Theory of Molecular Volumes. 987 



No doubt this regularity which we are discussing is capable 

 •of elucidating the constitution o£ unknown compounds. 



a/3 Dibrom alcohol according to Weger (Ann. 221. p. 61) 

 has a volume at the B.P. o£ 124*3. 



CH 2 Br . CH 2 . Br . CH 2 OH 



is the ordinary formula. 



The possible formulae are, on our hypothesis, 



CH 2 - Br 

 / 

 (ffl) Br-CH !! 



CH 2 - OH 



y 



-4-5 



CH- Br 



I ii 



(]V ) CH-Br 

 I |j 



CH-OH 



-6 or 7 



Volume of CH 3 . CH 2 . CH 2 OH 81-5 



less 2H 7-4 



74-1 

 plus 2Br 56-6 



2AV 130-7 



V 124-3 



A -6'4 



The formula of Weger's Dibrom alcohol is thus Number IV. 

 {probably) and is strictly analogous to the Tri-Hydroxy com- 

 pound Glycerol. Tri-chlor and Tri-brom Hydrin would be 

 similar. 



