[ i82 ] 



ILLUSTRATION OF THE TABLES. 



Few chymifts have made experiments appofite to my prefent 

 purpofe, and thofe that have made any relative to it, have gene- 

 rally negleded marking the temperature, and thus prevented an 

 exad comparifon of the refults they obtained with thofe that fhould 

 be expedted from the quantities of real acid and water fet forth in 

 my tables. 



The moft accurate of thefe experimenters was Hahn, who has 

 inftituted a confiderable number, of which an account is given in his 

 Differtation D<r Efficacia Mixtionis in Mutandis CorporiimVoluminibus; 

 of thefe I fhall feled a few, which I think by their coincidence 

 with the refults to be obtained, calculating from my tables, furnifti 

 a full proof of their accuracy, at leaft to as great a degree as can 

 be expeded in fubjeds of this nature. 



Of the Table of Vitriolic Acid. 

 iji Experiment. 



Hahn, to 800 grs. of vitriolic acid whofe fp. grav.* was 1,8489 

 at the temperature of 44.°, added 400 grs. of water in a veffel that 

 confined the vapours, and when the mixture was cooled down to 

 the temperature of the air he found its fp. grav. 1,54 5- — P- 48 



and 49. 



ylpplication. 



