304 EXAMINATION OF A CALCAREOUS STONl. 



Medium esti- If the quantities of carbonic acid gas produced in the fore- 

 oibontcacid S^'"? experiments be added together, and the average 



taken as follows ; 



:*?^ ] Extricated by heat. 



42- 



45-: 



42*40 7 Extricated by nitric andmu< 



43*00 I riatic acids. 



4)174-20 



43*55 Average. 



And if it be admitted, according to the' late accurately 

 conducted experiments of Messrs. Allen and Pepys, that 

 100 cubic inches of carbonic acid gas v^^eigh 47*26 grains, 

 then by the following calculation 43*55 grains will amount 

 to 92*14 cubic inches, which is within half a cubic inch of 

 the gas actually produced— 



47-26--*— 100 43*55 92*63 Gas collected. 



100 



47'26)435500(92*]4 7 Cubic inches by 



42534 J culation. 



. ..49 DiiT. 



cal- 



■ 



■ ! 



lOlbo — 

 9452 



7O8O 

 4726 



23540 

 18894 



4646 



The carbonic ,acld gas collected in the last experiment 

 being submitted to the test of limewater, by means of 

 Pepys' Eudiometer, from 98 to 99 parts out of 100 were 

 absorbed. 



The following therefore appears to be the result of the 

 ab#v€ analysis of 100 grains of thunder-pick ; 



Average 



