1863.] 497 



The double tartrate of quinidine and antimony was very carefully 

 examined for potassa by precipitating the antimony by means of 

 sulphuretted hydrogen ; it then left no perceptible residue on igni- 

 tion, and a drop of bichloride of platinum gave no precipitate. It 

 therefore could not contain potassa. 



Analysis. Dried in vacuo over sulphuric acid, it retains, appa- 

 rently uncombined, from -5 to 1 per cent, of water, which it loses at 

 the temperature of 100. 



The salt dried in vacuo gave the following results : 

 I. 0-3850 gramme gave '6750 gramme carbonic acid and '1780 

 gramme water. 



II. '2375 gramme gave '4175 gramme carbonic acid and -1270 

 gramme water. 



III. '5380 gramme gave *1398 gramme of antimonious acid, 

 SbO 4 . 



The compounds, after two recrystallizations and drying at 100, 

 gave the following results : 



IV. -5815 gramme gave TO 100 gramme carbonic acid and '2550 

 gramme water. 



V. *5110 gramme gave '893 gramme carbonic acid and *224 

 gramme water. 



VI. '7195 gramme substance gave '1949 gramme tersulphide of 

 antimony. This was dried in vacuo and contained 1*3 per cent, of 

 water j therefore *7195 gramme is equal to '7101 dried at 100. 



Theory. 



s I. II. III. IV. V. 



C 48 = 288 .. 47-28 47'8 47'94 47'36 47'66 



H 29 = 29 .. 4-76 5-13 5'94 4-87 4-87 



Sb = 120-3.. 19-74 20-53 19'61 



609-3 100-006 



In order to ascertain that the residue upon the filter, in addition 

 to uudissolved quinidine, contained precipitated teroxide of antimony, 

 it was washed with hot alcohol and dissolved in strong hydro- 

 chloric acid. This solution gave the characteristic reactions of anti- 

 mony with water and sulphuretted hydrogen. The mother- liquor, 

 which was quite neutral to test-paper, and from which as much as 



