Mr. Graham's Account of the Formation ofAlcoates. 333 



III. Alcoate of the Nitrate of Lime. 



Nitrate of lime may be obtained anhydrous with much 

 greater facility than nitrate of magnesia, as, after being dried 

 on the sand-bath, it may be heated in a glass-capsule by the 

 spirit-lamp without decomposition, although it partially fuses. 

 Boiling alcohol saturated with this salt formed a solution, 

 which became very viscid on cooling, and remained without 

 crystallizing for a whole day. But during a frost} 7 night it 

 was resolved into an amorphous solid, slightly moist, but with- 

 out any appearance of crystallization. This substance was 

 carefully dried in the usual way. 



14*8 grains were reduced by heat to 8*8 grains. This gives 

 6 grains alcohol to 8*8 grains nitrate of lime. The atomic 

 weight of anhydrous nitrate of lime is 10*25. Now, 



8-8:6:: 10*25: 6*98. 



In another case, 15*6 grains were reduced to 9*2, which 

 gives 6*4? alcohol to 9*2 nitrate of lime. But, 



9-2:6-4:: 10-25: 7-13. 



This approaches 7*1875, or two and a half equivalent propor- 

 tions of alcohol. The composition of the alcoate of nitrate of 

 lime would be represented on this view, by 



Two atoms nitrate of lime 20*5 



Five atoms alcohol 14-375 



34-875 

 In another strong alcoholic solution of nitrate of lime, a few 

 irregular crystals were deposited ; but the quantity was not 

 sufficient to admit of examination, although they proved that 

 this alcoate is capable of crystallizing. 



IV. Alcoate of Protochloride of Manganese. 



The protochloride of manganese, dried in a glass-tube, at a 

 red heat, was light, friable, and of a reddish colour. Alcohol 

 dissolved a very large quantity of it. When the solution was 

 made at a high temperature, the alcoate crystallized readily 

 upon cooling in plates with ragged edges. 14*6 grains of this 

 alcoate, carefully dried by pressure in blotting paper, were re- 

 duced by heat to 7 grains. The alcoate, therefore, consisted 

 of 7 grains protochloride of manganese, and 7*6 grains alcohol. 

 The atomic weight of protochloride of manganese is 8. Now, 



7 : 7*6 : : 8 : 8'686. 

 This slightly exceeds three atoms alcohol = 8*625, but the 

 approximation to the theoretical number is as close as could 



be 



