1835.] on Racemic Acid. 165 



18-125 

 I heated 20 grs. of the salt (previously dried in a gentle 

 heat) in a temperature of 310°. The loss of weight was 

 1*87 grs. This scarcely amounts to 1^ atoms of water. 

 Hence, if the preceding analysis (made many years ago) be 

 correct, tartrate of strontian dried at 310° still retains the 

 half of its water. To determine the point I heated the 

 residual 18*13 grs. for two hours, in a temperature of 325°. 

 The portion in contact with the glass had become slightly 

 yellow, and the weight was reduced to 16*54. Thus, the 

 total loss was 3*46 grs. According to this result the consti- 

 tuents of the salt are. Anhydrous salt . 14*75 



Water .... 3*085 

 This is rather less than 3 atoms of water, yet it confirms 

 the old analysis. Probably a little of the water had been 

 driven off when the salt was first dried. 



VII. RACEMATE OF LIME. 



We obtain this salt in powder when we mix together any 

 alkaline racemate, and any soluble salt of lime. I have 

 generally employed chloride of calcium and racemate of 

 ammonia, or of soda. It falls down in the state of a fine 

 powder, which may be washed, and dried on a filter. 



The particles of this salt have the property of adhering 

 together somewhat like clay, and they stick to every thing 

 with which they come in contact while moist. This makes 

 it very difficult to wash it. The best way is to allow the 

 sediment of racemate of lime to subside in a tall, glass jar, 

 then to draw off the clear liquid and fill up the jar again 

 with distilled water. By repeating this process three or 

 four times, the salt will be washed. It may then be collected 

 and dried on the filter. 



Racemate of lime is a white tasteless powder. Its sp. gr. 

 is 1*542. At the temperature of 58°, 100 parts of water 

 dissolve 0*029 of this salt. Boiling water takes up rather 

 more, but still, only a minute quantity. When heated to 

 450°, it becomes brownish yellow, shewing that a portion of 

 its acid has undergone decomposition. When the heat is 



