Concentrated Sulphuric Acid. — Vitriform Suhstances. 467 



many experiments made for the purpose. The concen- 

 trated acid is taken at QQ"" of the areometer. 



1. Acid at 60^ i 7. Acid at 30°. 



Sul|)huric acid 84,22 



Water 15,78 



2. Acid at 55'\ 

 Sulphuric acid .... 74,32 

 Water 25,68 



3. Acid at 50\ 

 Sulphuric acid .... 66,45 

 Water 33,55 



4. Acid at 45'. 

 Sulphuric acid .... 58,02 

 Water . 41,98 



5. Acid at 40°. 

 Sulphuric acid .... 50,41 

 Water 49,59 



6. Acid at 35°. 

 Sulphuric acid .... 43,21 

 Water 56,79 



Sulphuric acid .... 36,52 

 Water 63,48 



8. Acid at 25°. 



Sulphuric acid 30,12 



Water 69,88 



g. Acid at 20^. 



Sulphuric acid 24,01 



Water 75,99 



10. Acid at 15\ 



Sulphuric acid 17539 



Water 82,61 



11. Acid at 10°. 

 Sulphuric acid .... 1 1,73 

 Water 88,27 



12. Acid at 3°. 

 Sulphuric acid .... 6,600 

 Water 93,400 



Specific gravities of the above mixtures corresponding to 

 the different degrees of the areometer : 



Sp. Grav 



Acid at 



5 degrees 



10 



15 



20 



25 , 



1,023 

 1,076 

 1,114 

 1,162 

 1,210 



Sp. Grav. 



Acid at 40 degrees , 1,375 

 45 



50 

 55 

 60 



1,466 

 1,524 

 1,618 

 1,723 



1,842 



30 1,260 



35 1.315 



This last table is useful to those who have not an areo- 

 meter at hand, since, the specific gravity of any given acid 

 being ascertained, the proportion of concentrated acid con- 

 tained therein is shown by turning to the corresponding 

 decree of the areometer in the former table. The strength 

 of the acid at any intermediate degree may easily be found 

 by the rule of three. 



M. Lesauvage has published at Paris an Inaugural Dis- 

 sertation, entitled, Rechcrckes sur les Eff'ets du Fcrre et des 

 Substances vitriformes portces a I'interieiir dcs Organes di- 

 gestifs ; in which he has proposed the following question : 

 " Whether glass and vitriform substances, more or less, 

 G g 2 coarsely 



