P0808 poy) 
Analysis of American Limestone. By J. Cutbush, Che- 
mist and Apothecary. 
Philadelphia, 13th September, 1810. 
Sir, 
I have made the necessary examination of the lime- 
stones you wished me to analyze. The comparative 
quality, with respect to the ingredients of each kind 
(hard white, and black micaceous) we may, therefore, 
the more readily judge of. 
While one variety, on the one hand, according to my 
experiments, corresponds to that mentioned by Mr. 
Tennant, the other appears on the contrary, to be com- 
posed of more calcareous earth, and I presume would 
answer all the desirable purposes of agriculture.* 
Withrespect to the limestone, when it comes under 
the head of magnesian limestone, agreeably to the name 
of Mr. Tennant, I would merely remark, that when the 
magnesian earth exceeds a certain per centum, it might, 
with strict propriety be referred to this class; for in most 
of the varieties of limestone, the magnesian earth is 
more or less abundant. 
* Mr. Cutbush in this instance falls too hastily in with Mr. Tennant’s 
hypothesis, in giving the preference to the calcarious lime, for agricultu- 
ral purposes. Whereas it is a fact well known, that Mr. Barett’s lime 
above noticed, (which agrees with Mr. Tennant’s magnesian kind) fetches 
a higher price than any other limes in these parts ; and such is the demand 
for it, that it cannot be got burnt fast enough.—When it is known that a 
kiln is ready, the waggons come the night before it is opened, and next 
morning they never stop loading until the whole is finished. This is sold 
at fifteen cents per bushel at the kiln, while the others are bought for 
twelve and a half cents per bushel, 
WO Le. PEs Qq 
