462 Notices respecting New Books. 



In 1864, therefore, the iodide of methyl proved itself more 

 diathermanous than the iodide of ethyl, while both of them 

 were more diathermanous than benzol. In 1880 the case was 

 precisely the reverse. Suspecting that the discrepancy might 

 be due to impurity, I requested my friend Professor Dewar to 

 subject the liquids to a further process of purification. Tested 

 afterwards, they produced the following deflections: — 



A. E. C. 



Bisulphide of carbon . 5*0 5*0 4'0 



Chloroform .... 17-0 15'0 6'0 



Iodide of methyl . . . 39-4 33-0 8-0 



Iodide of ethyl . . . 33-0 35'0 12'5 



Amylene 42'0 41-0 16-0 



Sulphuric ether . . . 44'3 43'5 18'2 



Acetic ether .... 46*2 45*5 22'0 



Formic ether .... 47'5 46'9 22'2 



Under A and B respectively are the deflections produced 

 by the liquids prior to and after purification. The iodide of 

 methyl falls from 39° - 4 to 33°, while the iodide of ethyl rises 

 from 33° to 35°. The relative positions occupied by the 

 liquids in 1864 are thus restored. Benzol, however, remained 

 permanently lower than before. Under C are the deflections 

 produced by the vapours of the purified liquids. Here also 

 the positions of the two iodides are reversed, vaporous absorp- 

 tion following the order of liquid absorption. I have fre- 

 quently encountered cases of this character. The simultaneous 

 change of diathermic position of liquid and vapour indicates 

 that the foreign ingredient, whatever it was, possessed approxi- 

 mately the same volatility as the substance which it vitiated. 



[To be continued.] 



LIX. Notices respecting New Booh. 



Kant's Critique of Pure Reason: translated into English by F. Max 



MtiLLEK. 2 vols. Loudon ■ Macmillan and Co. 

 r rUl!S translation of Kant's great work appears in commemoration 

 ■*- of the Centenary of its first publication. In the second volume 

 we have the work proper, namely, a translation of the first edition ; 

 and in the first volume we have a preface by the translator, an 

 Historical Introduction by Prof. Noire, and a translation of the 

 supplements which were added by Kant to the second edition. 



In his preface the eminent translator states why he thought he 

 might translate Kant's Critique, why he thought he might to do it. 



