224 PROCEEDINGS OP THE AMERICAN ACADEMY 



0.1000 gr. substance gave 0.1833 gr. AgCl. 



0.1944 gr. gave 0.4052 gr. CO^ and 0.0497 gr. H^O. 



c 



H 



CI 



Metachlorbenzoic anhydride is readily soluble in alcohol, ether, 

 benzol, and chloroform, less easily in ligroine. It crystallizes best from 

 benzol, in the form of yellowish white needles. 



III. Parachlorhenzoic Anhydride* 



This substance was prepared from parachlorhenzoic acid, ra.pt. 

 236°, phosphoric anhydride, and benzol, in the same manner as the 

 ortho and meta anhydrides. Like these it is easily soluble in alcohol, 

 ether, benzol, and chloroform, less soluble in petroleum ether. It 

 crystallizes readily from warm benzol in glittering leaflets, which melt 

 at 186°. The analyses gave : — 



0.1718 gr. substance gave 0.1648 gr. AgCl. 



0.2011 gr. gave 0.4185 gr. CO2 and 0.0590 gr. H2O. 



c 



H 



CI 



Anhydrides of the Monobrombenzoic Acids. 



The anhydrides of ortho, meta, and parabrombenzoic acids were 

 prepared from the acids in a similar manner. The orthobrombenzoic 



* The paraclilorbenzoic acid used in tliis experiment, as well as the para- 

 brombenzoic acid, to be mentioned later, were kindly furnished us b}' Prof. C. L. 

 Jackson of the Harvard College Laboratory, to whom we would here express 

 our warmest thanks for both preparations. 



