ELISHA MITCHELL SCIENTIFIC SOCIETY. 53 



acid, and the separated camphoric acid purified by crys- 

 tallizing from water. The yield was about the same as that 

 obtained by Wreden, when great care was exercised in the 

 purification by crystallizing fi'om water. The pure crystals 

 gave the melting point \y6°c. (uncorrected). A ten percent, 

 solution of caustic potash was saturated with camphoric acid 

 and the solution of potassium camphorate so obtained was 

 used in preparing the other compounds. 



Manganese Camphorate. When a few drops of potassium 

 camphorate were added to a nearly saturated solution of 

 manganese sulphate in a small watch-glass, no precipitate 

 was formed until it had been heated on the water-bath. A 

 white amorphous precipitate was then gotten, which was 

 easily soluble in cold water. This could always be repre- 

 cipitated on heating. In preparing the salt on a larger 

 scale the mixture of potassium camphorate and manganese 

 sulphate was heated to precipitation and the precipitate 

 well washed with hot water. The precipitate was 

 then dried at 100°. If exposed in the moist condition it 

 showed browning. There was a slight discoloration even 

 when rapidly dried. At 150° decomposition was very slight; 

 at 200° it was marked. When some of the purified manga- 

 nese camphorate was dissolved in water and evaporated over 

 sulphuric acid a crust of the salt was obtained, but no crystal. 



I. .2790 grammes of su' stance gave .0859 primines, Mn304 



II. .4460 " " " " 1"80 

 III 4875 " ' " " .1330 



landlU was determi'ei precipitjtiou as carliouate, II by ignition. 



p. c. Mn. ca'c f.)und 



Mn. Ci„H,,0, 23 07 1.22.07 11.21.39 III. 22.50 



As it was very difficult to wash away all of the potassium 

 camphorate the low results are probably due to the presence 

 of the same as an impurity. 



Chromium Camphorate. On adding potassium campho- 

 rate to a solution of chromium sulphate a heavy precipitate of 

 a biuish-green color is formed. This is not very soluble and 

 can be thoroughly washed with cold water. It can be dried 

 at ioo°c. losing all water at this temperature. Before reach- 

 ing 150° slow decomposition sets in. 



Analysis. 



I. 4280 gratnm'S of substance yi Ided on ignifon .0810 grra. Cr-j O3 



II. 16870 " " * " •' " .134J " C'-o O, 



calc found in I. found in II. 



Or2 (Dio Hn 04)3 P.O. Cr 14 81 1^5 93 14 40 



The Sample in I w as different fi om that in II and evidently nut so 

 pure. * 



