[ 190 ] 



8co grains (the quantity of this 2d mixture) muft contain 273,54 

 grains of real acid, and confequently 100 grains of thiis new mix- 

 ture contains 34,19 grains real acid, which indicates very near the 

 fp. grav.. 1,2779, Vv'hich differs from Hahn's refult by --lloi being 

 fo much high r. 



But this fame experiment may alfo be confidered as a mixture 

 of 4-00 grains of the ftrong acid 1,5025 with 400 grains of water, 

 then as the 400 grains acid liquor contains 273,56 grains real acid 

 as already faid, 800 grains of the mixture fhould contain the fame 

 quantity of real acid, and the fame fp. grav. would be found to 

 refult as above. 



Experiment '^d. 



In this experiment he, added 2 parts water (fuppofe 200 grains) 

 to I part of the fp. of nitre 1,5025, much heat and copious red 

 vapours were produced, infomuch that a few grains of the weight 

 of the whole were loft (about 3 per cent.) and the fp. grav. was 

 1,1723, the temperature is not mentioned, but it feems probable 

 it was 64^, the temperature at which, he fays, the mixture was 

 made, then at 60^ it svould be 1,1740. 



Jlpplicatlon, 



Here the 300 grains of mixed acid liquor contain'ed 68,39 ^^'^ 

 acid, then 100 grains of it would contain 22,79, which is in the 

 table, and indicates the fp. grav. 1,1845, which exceeds Hahn's 



refult 



