ii9Sli Messrs. Play fair and Joule on 



Sp. gr. 

 CuO, SO3, vol. of salt 22-0 ... 3-631 



Sulphate of Iron ^ FeO, S03 = 75-3. - Half an equivalent of 

 this salt, 37'65 grains, caused, in two experiments with the 

 same salt, a rise of 12*0, which gives for the equivalent 24*0 

 and a specific gravity of 3*138. 



Sulphate of Cobali,CoO,SO.^= 77-69.— On immersing 19'42 

 grains of this salt in turpentine, an increase of 5'5 was ob- 

 tained in two experiments ; this gives for the equivalent 22'0, 

 and for the specific gravity 3*531 . 



Sulphate q/' Soda, NaO, S03 = 71'43. — On throwing a whole 

 eqirtvaient of this salt into turpentine, the increase was only 

 27*5 in several successive experiments, which gives for the 

 specific gravity 2*597. Karsten found its specific gravity to 

 be 2*631, a result approximating to our own; attention is 

 drawn to this circumstance because both results are anoma- 

 lous. 



Sulphate of Silver, AgO, S03=156'4'8. — On immersing in 

 turpentine 78*24 grains of this salt, the increase was 14*7, 

 which gives as the volume of the equivalent 29*4, and a specific 

 gravity of 5*322. 



Chromate of Silver, AgO, Cr03= 168*49.— The fourth of 

 an equivalent of this salt, 42*12 grains, gave an increase, when 

 thrown into turpentine, of 7*3 in two successive experiments. 

 This gives 29*2 for the volume of the equivalent, and 5*770 for 

 the specific gravity of the salt. 



Sulphate of Copper and Potash, CuO, SO3 + KO, SO3 



= 167*31. — 41*82 grains, the fourth of an equivalent, thrown 



into turpentine, caused an increase of 14*9 in one experiment 



and of 15*0 in another, the temperature in both cases being 



54°. 



Sp. gr. 



CuO, SOg-f KO, SO3, vol.ofsalt 59*6 ... 2*807 



60*0 ... 2*788 

 Mean . . 59*8 ... 2*797 

 Sulphate of Nickel and Potash, NiO, SO3 + KO, SO3 = 

 164*99. — 41*54 grains caused an increase of 14*2 in one ex- 

 periment and 14*5 in a second, the temperature in both cases 

 being 54°. 



NiO, SO3+KO, SO3, vol. ofsalt 56'4 ... 2*9l5 



57*5 ... 28*69 

 Mean . . 56*95 ... 2^7 

 Sidphate of Zinc and Potash, ZnO, SO3 + KO, SO3 = 

 167*86.— 41*96 grains, the fourth of an equivalent, placed in 

 turpentine, caused an increase of 14*9 in two experiments. 



