CAPILLARY ATTRACTION IN RELATION TO CHEMICAL COMPOSITION. 263 



In the cnse of terpene, it' we assume 1=196, then the result agrees 

 with Bruhl's investigation, hut if F=186.3 then there can he no 

 douhle bond, or at most only one. Quinoline has only five double 

 bonds according to the accepted formula, while the calculation from 

 the capillary heighl indicates six such linkings. Carvol also show s 

 a similar peculiaril v. The capillary value of the oxygen atom varies in 

 a very peculiar manner; in alcohols il is only 31, in ethers and acetals 

 it is 11. while it attains its seemingly normal value in aromatic com- 

 pounds where it is 55. In aldehydes ami acetones h is 7 1 55 + 19. 

 The calculai ion according to this formula seems to justify the com- 

 monly accepted constitution of paraldehyde 



CH,C _(VII . K*F LM .;:,t 6x44 + 12x21.5 + 3x44. 







It may he objected that the value for the group I C < I L07 has 

 been obtained by making the value for hydrogen too high, and that 

 trie conclusion about the atomic linking arrived at in this way is 

 not trustworthy. Bui the agreemenl between the observed and the 

 calculated values of /v'-I 11 " 1 for piperidene which has no douhle bond, 

 hut which bas two atoms of hydrogen less than what a saturated 

 compound oughl to have, seems to prove the correctness of the 

 above conclusion. When well worked out the capillary phenomena 

 are likely to atford some insighl into the atomic grouping of a 

 molecule, but this can not be attempted with confidence until more 

 accurate data are amassed. 



So far the claim of the formulas seems to be fairly made out, 

 still there are many grave considerations which tend to show that the 

 connections expressed by the equations are more accidental than 



