On the Animal Calculus, 1 9 1 
Experiment I. 
Piece of Calculus that weighed two 
hundred and thirty Grains, and was 
fomeching lefs than i of a cubic Inch in bulk, 
being diftilled in a Gun Barrel, as defcrib’d in 
Vegetable Staticks, Vol I. Exper. LXXVII. 
p, 185). there arofe from it, in Diftillation five 
hundred and fixteen cubic Inches of elaftic 
Air, that is a Bulk equal to fix hundred and 
forty five times the Bulk of the Scone, Co that 
above half the Scone was raifed by the Adion 
of Fire, into elaftic Air. The remaining Calx 
weighed forty nine Grains, that is part of 
the Calculus ; which is nearly the fame Pro- 
portion of Calx^ that Dr. Slare found remain- 
ing, after the Diftillation, and calcining two 
Ounces of Calculus^ “ one Ounce and three 
Drams of which, he fays, evaporated in 
the open Fire (a material Circumftance, 
“ which the Chymifts rarely enquire after) 
of which we have no Account. ” Philof^ 
TranfaB. Lowthorfs Abridgmenty Vol III. 
p, 175). the greateft part of which was, we 
fee by this Experiment, raifed into permanent, 
ly elaftic Air. 
2, Hence 
