274 Mr. J. J. Waterston on the Application of the Vapour-density 



The above, expressed by the V.D. notation, is 



1 mol. broin. 1ptt2-r„ 1 f „ . r 1 mol. or possibly 



of olef. J bM * r I I Br Ag { 2Br ^ A J j mol acetate of 



It will be remarked that the reaction consists of CH 2 and Ag 

 changing places. 



P. 407. " Decomposition du Glycol diacetique par l 9 hydrate de 

 potasse sec. 



(G^}° 3+3KHO = {^hJ}° 9+2 { G2 ^} -" 



Glycol diacet. Glycol. Acetate de 



potasse. 



Expressed by the V.D. notation, the above is 



acetate 



1 ^TflY f } C2 H 30li - CH *° L fCH'O^.KO*! » 2$*£ 



1 mol. of caustic 1 j^Q2 JJQ2 |CH 2 02 HO^ J * mo ^' 8^°°^ 



potash J J . *■ 1 vap.- density 



L meas. =31. 



Heat is evolved while KO* and CH 2 0^ change places. 



The symbol 2KH0 employed by M. Wurtz to denote caustic 

 potash, shows that he does not follow the new school in their 

 views on the constitution of this body. 



P. 412. " Action du Potassium et du Sodium sur le Glycol" 

 11*5 parts by weight of sodium saturate 31 parts of glycol, 

 during which heat is evolved, pure hydrogen is disengaged, and 

 a white crystalline matter is formed, which is £ 2 H 5 NaO 2 " glycol 

 monosode," " derive du glycol par la substitution d'un equiva- 

 lent de sodium a un equivalent d'hydrogen." This, expressed 

 by the V.D., would seemingly be 



"1 mol. glycol mono- 

 xj ir lit , r A i i i Sode > in which the 

 Halt a mol. lj^* |CH 2 2 H*Na*C)* views of the new 



of sodium J x , I -J ' J school as to the 



1 mol of }CH 2 0\HOj | H * escapes atomic constitution 



gty co1 J J L r would seem tQ be 



^ realized. 



But there is another arrangement possible, viz. 23 sodium to 

 62 glycol, or 1 molecule of sodium to 2 molecules of glycol uni- 

 ting to form one molecule of the glycol monosode. Thus 



Na 



CH 2 0t.H0i 



CH 2 0*.HO* 



r H, 1 molecule of hydrogen evolved. 



i i i f 1 mol. of give. 



2(CH*0*) .HO*.NaO*| monoso( y (s ^ d)j 



