1817.] Dr. Richard Watson, 261 
Salts, Specific Gravity. 
Baga eis MRT BF er 0 ahi <1 TASH 
White sugar candy ............ cores P5GZ 
Acetate of potash’ 22... 0) de oe TGF 
Glauber’s salt from Lymington ...... 1°657 
Rochelle salt’..). 05/7050 500 ope Swe laee 
PIG en eee cee eee Ue Ss 1°757 
Romig 5 c3 eis A sass @onltfoy 
Seapets OP WOH) a. one ss Sh Sane oe SIS 
Peeprate OF ZING 03). sce a dete sauawar 1980 
oa: CR aie: v etn ech eretaitete’ otters +e 1°933 
Pe miGe SAN! FOU SE Ped Se aie eS 
Sulphate of copper ..... Peres seeee 2°230 
em aan ane fs8) Lee re vavennguce ae 
Sulphate of potash ........ er eveces 2636 
Sulphate of iron calcined to whiteness .. 2°636 
Carbonate of potash ................ 2°761 
Setntisad sale“ 253 oi ee Pe ee 
Corrosive sublimate’.............22- 4°142 
Sulphate of mercury .............. 6°444 
The solution of all salts in water is greater than the mean of the 
specific gravity of the salt and of the water. Hence a condensation 
obviously takes place during the solution; and of course as the 
solution goes on, the water is constantly sinking in the neck of the 
matrass, though it never sinks so low as the mark at which it stood 
before the addition of the salt. We may infer from this fact that 
Dr. Watson’s method for determining the specific gravity of salts 
answers worst for those that dissolve most rapidly in water. 
3. The specific gravity of water at 41° saturated with different 
salts, The following table exhibits the facts which he ascertained :— 
Substances in solution, Sp. Gr. of solution, 
EAE EE RES ALA Rs SOR a 1-001 
Ss ih ngak yy catia » 1001 
PRMCDIOUN BENG os oa fe wid neaaaas jwise LOOS 
OM Tidethieh sroll a) 0s 6/5: 9 G0 ah RA aR 0 oe OL 
Corrosive sublimate .. 2... 5 sec ecsls vs 1037 | 
ROATD ei x5 ie! shatialso' cl'el'a igh eeinie teres aaa Ae led 
Salphate. of soda .....cccessnneases L052 
Sulphate of potash ............. oo. 19054 
COMED GUE SG wewe:<s 0's cc Pes eek.c. 1198 
Arsenite of potash ........0.....0. 1°184 
Glauber salt of Lymington .......... 1°232 
Sal-ammoniac .......... COSINE ee -1OT2 
Carbonate of ammonia.............. 1077 
Crystals of kelp ewes felled vad ees 1087 
NG SRO FUME owns ore'ne ceseieR | LORS 
