[ 172 ] 



1,2384 at - 55<»- 



1,2406 at - 50*^ 



1,2417 at - 45« 

 hence nitrous acid, which at 60' is 1,2363, gains or lofes by every 

 degree between 60° and 70*^, 0,00043 and 0,00036 by every 

 degree between 60* and 45® ; and we may affume 0,0005 as the 

 variation incident to every degree between 60*^ and yo*' in nitrous 

 acid, whofe denfity at 60*? is between 1,3 and 1,4 and 0,0004 for the 

 variation between 44* and 60* 



Of Marine ^cid. 



I formerly found that this acid of the denfity 1,196 at 33* 

 became of the denfity 1,1820 at 66°, the alterations of acids of 

 lower fp. grav. I have not examined, but I found that in general its 

 dilatability is greater than that of nitrousacid of the fame denfity. 



OF THE USE OF THESE TABLES. 



Problem ift. 



An extratabular fpecific gravity being given, but intermediate 



between fome of thofe in the table, Xajind the quantity of real acid 



in 100 parts of fuch acid liquor. 



ift. 



