430 Notices respecting Neiv Books. 



found that chlorobenzole, C^'^ H*^" CF, which is commonly re- 

 garded as the chloride of the biatomic radical C^"* H'', when 

 digested for some months with aqueous ammonia, is converted 

 into hydrobenzamide, the formation of which would be thus 

 expressed : — 



3(Ci4 H6" CF) + 8NH3=N2(Ci'' Hs'V + eNH'* CI. 

 Chlorobenzole. Hydrobenzamide. 



Hamitzki* examined the action of phosgene gas on aldehyde. 

 When vapours of aldehyde are brought in contact with phosgene 

 gas, a brisk action is set up, with disengagement of hydrochloric 

 acid, and formation of a volatile product whose vapours condense 

 to a liquid, which can be obtained in ciystalline lamellae, melts 

 at 0°, and boils at about 45°. The analytical results, confirmed 

 by a vapour-density determination, lead to the formula C^ H^ CI. 

 Its formation would be thus expressed : — 



C4H4 02 + C2 02CF=C'»H3C1 + HC1 + 2C02. 



Aldehyde. Chlorocar- New body, 

 bonic acid. 



The new substance, which is named chloracetene, is isomeric 

 with chloride of vinyle, or chlorinated ethylene ; and their vapour 

 densities are also identical. But in their physical properties the 

 two substances differ materially, and more especially in their 

 action upon water. When chloracetene is placed in water, it 

 assumes a buttery consistence, and then dissolves with decom- 

 position, forming hydrochloric acid and aldehyde, 



C4 H3 CI + 2 HO = C* H-* OH HCl. 



Chloracetene. Aldehyde. 



LXXIII. Notices respecting New Books. 



A Treatise on Differential Equations. By George Boole, F.R.S., 

 Professor of Mathematics in the Queens University, Ireland, Hono- 

 rary Member of the Cambridge Philosophical Society. Cambridge : 

 Macmillan and Co. 1859. 



PROFESSOR BOOLE has long been known in the mathematical 

 world as one of the most original and profound analysts of the 

 present century. On the subject of differential equations, in parti- 

 cular, his researches (printed in the Philosophical Transactions, 

 Philosophical Magazine, Cambridge Mathematical Journal, &c.) 

 have been of the highest order, and have contributed very greatly to 

 the extension of the science. He has now condescended to the task 

 of writing an elementary treatise on his favourite subject ; but, as 



♦ Repertoire de Chimie, March 1859. 



