On Analyzing Lime. 307 
ascertain if this earth existed under the circumstances 
we have already stated. : 
The other specimen of limestone, which is far more 
friable, and of a dark micaceous appearance, was solu- 
ble with more facility in muriatic acid. The solution 
was soon effected ; the addition of carbonate of ammonia 
separated the lime in an abundant precipitate ; and the 
filtered liquor, after adding the carbonate, gave a slight 
precipitate with phosphate of soda. Magnesia, however, — 
as already stated is always found, more or less, accom- 
panying lime. 
With much respect, Sir, 
I remain yours, &c. 
James CurTsBusH. 
Joun Lance. 
Course of Crops. 
Advantage is taken, of the vacant space in this sheet, by 
the writer of the note, page 144, on General Armstrong’s 
letter relative to the Dravezl plough and the tenant’s course 
of crops, page 145, to correct an error. The words “ and his 
course of crops,” should have been omitted. There cannot 
be a worse course than wheat, rye, and oats, immediately 
succeeding each other. 
_ a ee — 
