494 [March 19, 



A moderately strong solution of chloride of zinc, containing a slight 

 excess of hydrochloric acid, is poured into an alcoholic solution of 

 quinidine, when the double salt precipitates as a granular powder. 

 It is very slightly soluble either in hot or in cold water, but dissolves 

 readily in dilute hydrochloric acid and in spirit of 50 per cent., from 

 which latter it crystallizes in a form very similar to that variety of 

 carbonate of lime known as " dog-tooth" spar. 



The specimen analysed was crystallized from dilute hydrochloric 

 acid and dried at 100. *447 gramme gave '4825 gramme chloride 

 of silver, equal to '1193 of chlorine. This corresponds to 26' 7 per 

 cent, of chlorine. The formula C 40 H 24 N 2 O 4 , 2HCl+2ZnCl re- 

 quires 26-65 per cent. 



Basic Chloride-of-Zinc Salt, C 40 H 24 N 2 O 4 , H Cl+ZnCl. The 

 neutral salt described above appears to lose a portion of its hydro- 

 chloric acid and chloride of zinc after repeated crystallizations. A 

 solution of the salt so treated deposits, upon slow evaporation, 

 crystals of considerable size, consisting of hexagonal plates and 

 prisms. 



i After drying at 100, these were submitted to analysis; the zinc 

 and quinidine were precipitated together by carbonate of soda, and 

 after washing well with water, the quinidine was removed by boiling 

 alcohol ; the residuary oxide of zinc was then again washed with 

 water, and ignited in the usual way. 



7335 gramme of the salt yielded *0680 gramme of oxide of zinc, 

 equivalent to '05456 of metallic zinc, or 7*44 per cent. 



The formula C 40 H 24 N 2 O 4 , 2 H Cl + 2 Zn Cl requires 1 2'2 per cent. 

 The formula C 40 H 24 N 2 O 4 , H Cl + Zn Cl requires 7'58 per cent. 

 Oxalate of Quinidine, C 40 H 24 N 2 O 4 , HC 2 O 4 , HO. The oxa- 

 late of quinidine is formed by exactly neutralizing oxalic acid by 

 quinidine. It consists of very small brittle crystals, which are 

 almost insoluble in cold, but comparatively soluble in hot water, 

 from which it crystallizes again on cooling. After being purified by 

 two recrystallizations and dried at 100, it was submitted to analysis. 

 '206 gramme gave '502 carbonic acid and '133 water; this corre- 

 sponds to 66-45 per cent, of carbon and 7*17 of hydrogen. 



The formula C 40 H 24 N 2 O 4 , HC 2 O 4 + HO requires 66'67 per cent, 

 carbon and 6*88 per cent, hydrogen. 

 This is evidently, therefore, the neutral oxalate, and differs wholly 



