410 



.1. s.VKURAI 



GH., 



(Kiichler.) 



The agreement Ijetween the observed and the calculated values 

 for (he specihc volume of «iiuphor. viz. 187.42 and 187.2 respectively, 

 is certainly very remarkable, but one does not feel very much inclined 

 to accept any conclusion bast'd upon a method of calculation ap- 

 parently open to so y-ravc a criticism as J. have indicated. 



A\'ith our present imperfect state of knowledge regarding the 

 relation between specific volumes of compounds and their ' consti- 

 tuHon,' espcciallv in the case of aromatic compounds, wc can neither 

 make a free nor a safe application of it in the discussion of the 

 probable constitution of snrh liodics as camphor and borneol. 



It is pi-obali](', for instance, that the specific vohnne of carlion 

 may vary not only according as it exists in the benzene nucleus or in 

 tlie side-chains, but also according as it is condjined Avitli 1, 2, o, or 

 4 other carbon atoms, and ao-ain accordiri"' to the nature of other 

 atoms directiv combint-d with it. Schiff, indeed, has ])ointed out 

 that the specific xoluini' of carlion may a ary from N to 1."!. and that 

 of oxygen from 5.6 to H). 



The ditference observed between the specific volumes of 



(1) Para chlorotoluene CJl,. CM,. CI = l;M.!)l 



(2) r.cnzyli,' chhn-ide C, 11,. CIL. CI - 13;b47 



may, for example, be due to either one or all of the following 

 differences : 



