490 Messrs. Playfair and Joule on 



I. BaO, NO5, vol. of salt 



II 



Ill 



IV 



V 



Mean . . 39*84 ... 3*284 



Nitrate of Strontia = 106 0. — Half an equivalent of this 

 salt, 53 grains, was dissolved in 1000 grains of water, with an 

 increase of 13*0, the temperature being 62° ; 106 grains dis- 

 solved in 1000 grains of water, with an increase of 27*0 at a 

 temperature of 63°. 



I. SrO, NO5, vol. in solution 26*0 



II 27*0 



Mean . . 26-5 



53 grains immersed in turpentine gave an increase of 19*6; 

 and this result was confirmed by a second experiment. 



Sp. gr. 

 SrO, NO5, vol. of salt 39*2 ... 2*704 



Nitrate of Black Oxide of Mercury, HggO, NO5 + 2HO 

 = 282*0. — This salt, in beautiful large transparent crystals, 

 was dissolved in water containing nitric acid, to prevent the 

 formation of a subsalt ; ^0'5 grains thus treated caused an in- 

 crease of 13*5. 



Protonitrate of mercur}"^, vol. in solution 54*0 



On immersing the same quantity of salt in turpentine, the 

 increase in three experiments was 14*8, 14*7, and 14*7. 



Sp. gr. 



I. Protonitrate of mercury, vol. of salt 59*2 ... 4*763 



II. ... ... ... 58-8 ... 4*796 



III. ... ... ... 58*8 ... 4*796 



Mean . . 58*9 ... 4*785 



Nitrate of Copper, CuO, NO5 + 3HO = 120-8.— Half an 

 equivalent (60-4 grains) dissolved in 1000 grains of water 

 with an increase of 22*4 at 60°, and in a second experiment 

 of 22-6 ; in a third experiment, 30*2 grains, dissolved in the 

 same quantity of water, gave an increase of 11*4. 



I. CuO, NO5, vol. in solution 44*8 

 II. ... ... 45*2 



III. ... ... 45-6 



Mean . . 45*2 



In two experiments, 60*4 grains thrown into turpentine 



