i ae 
CHEMICAL COMMUNICATIONS and ENQUIRIES. 
By ROBERT PERCEVAL, M.D. and M.R.LA. 
Marine Acid, 
F OUR pounds of decrepitated falt were decompofed by two Read Nov. 
pounds of vitriolic acid (fp. gr. 1,845) diluted with the fame % 179% 
weight of water. By means of a tubulated receiver, the produa& 
was divided into three portions, the two firft confifting each of 
12 ounce meafures, the laft of 10. The fpecific gravity of thefe 
portions was as follows : 
1ft portion - 1,181 
ad - - I,1Ig 
ad r= - - 1,191 
On repeating the experiment, the refult turned out fomewhat 
different, the 1ft and 2d portions being both ftronger ; this pro- 
bably depended on the heat having been more moderate in the 
latter experiment, in confequence of which lefs marine acid air 
was loft than in the former. 
Specific. 
