Mr GRAHAM'S Account of the Formation of Alcoates. 189 



ing in plates with ragged edges. 14.6 grains of this alcoate, 

 carefully dried by pressure in blotting paper, were reduced 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. 



I '' ^ 



This slightly exceeds three atoms alcohol 8.625, but the ap- 

 proximation to the theoretical number is as close as could be 

 expected. The composition of this alcoate may therefore be ex- 

 pressed by 



One atom protochloride of manganese, . 8. 



Three atoms alcohol, 8.625 



16.625. 



5. Alcoate of Chloride of Zinc. 



Alcohol dissolves chloride of zinc with great facility, and the 

 solution when filtered is of a light amber colour. This solution 

 may be concentrated to a very great extent without injury, arid 

 becomes so viscid when cold, that it may be inverted without 

 flowing perceptibly. It is not till so concentrated that it begins 

 to deposit crystals, which are small and independent, but appa- 

 rently of no regular shape. A viscid solution, in which crystals 

 formed, was found to be composed 20 parts chloride of zinc, and 

 7 parts alcohol. The small proportion of alcohol is astonishing ; 

 yet no more alcohol was given out when the chloride was heated 

 nearly to redness, and began to volatilize ; nor did a portion of 

 the chloride thus heated take fire when exposed directly to the 

 flame of a candle. 



