20 Experiments and Observations on 
following are some of the results of my en- 
quiries, stated with as much order as the 
short time allowed me will permit. 
Carbonate of ammonia is manufactured in 
the large way only by a very few people in 
the kingdom. The process which all chemi- 
cal authors recommend is to take pulverized 
sal ammoniac (muriate of ammonia) and pul- 
verized chalk or carbonate of lime; to mix 
these intimately and to apply heat to the mix- 
ture; the carbonate of ammonia is formed by 
doubledecomposition and sublimes intoa glass 
receiver. This process however, I have rea- 
son to believe, is not the one adopted by any 
of the modern manufacturers, as being too 
expensive. They obtain an impure ammonia 
or carbonate of ammonia from the distillation 
of bones or other animal matter, saturate the 
ammonia by sulphuric acid and crystallize the 
sulphate of ammonia; then this sulphate is 
mixed with carbonate of lime and sublima- 
tion performed as above. The sulphate of 
lime remains in the retort, and the carbonate 
of ammonia sublimes. 
When carbonate of ammonia is pulverized 
and spread upon paper it loses weight very 
rapidly ; but in a few hours it ceases to lose 
any more weight, and at the same time has 
lost its pungent smell. A slight ammoniacal 
