[nm] 
Tue laft eleven numbers were only found by analogy, ob- 
ferving the feries of decrements in the four preceding denfities, 
and therefore are to be confidered barely as approximations. 
To reduce vitriolic acids of given denfities at any degree of 
temperature between 49° and 70° to that which they fhould 
have at temperature 60°, in order that their proportion of 
ftandard may be thereby inveftigated, J made the following ex- 
periments : 
Degrees of | Sp. Gr. of | Sp. Gr. of 
A. B. 
Sp. Gr. of 
Temperature. ee 
710° 1,8292 | 1,6969 | 1,3845 
6<° | 1.8317 | 1,6983 | 1,3866 | 
60 1,8360 {| 1,7005 | 1,3888 
55 1,8382 | 1,7037 | 1,3898 
50 1,8403 | 1,7062 - - 
| 49 | | 1,8403 - - 1,3926 
Hence we fee that vitriolic acid, whofe denfity at any degree 
between 49° and 70° refembles or approaches the correfponding 
denfity in the column A, gains or lofes 0,00126 of its fpecific 
gravity by every two degrees between 60° and 70° of Farenheit, 
and 0,00086 by every two degrees between 49° and 60°. 
Secondly, that any vitriolic acid, whofe denfity at any degree 
between 50° and 70° refembles or approaches to the correfpond- 
ing denfity in the column B, gains or lofes 0,oo158 for every 
two 
