242 



Off SALTS. 



X*ofs of weight 

 in each by efflo- 

 rescence. 



Left to efflorefce. Loir. 



Sulphate of foda - 61 days - 203 grains of water. 



Phofphate of foda - 39 - - 91 



Carbonate of foda - 5 1 - - 86 



It mould feem from this table that thefe three falts ought to 



be clafled in the preceding order ; but it muft be obferved that 



falts contain more or lefs water, in proportion as they cryftal- 



Confiderations ize flowly or*rapidly. The number of days which were em- 



ieemsto Sate pl°y ed in the efflorefcence of thefe falls thould vary, both in 



no ufeful refult proportion to the water they contained, and to the extent of 



in deliquefcent mr face which they expofed to the aaion of the furroundinsr 

 falts expofed. ,,,-,. r * ■ ^ r • 



air; ana thereiore the time or their emorelcence can give no 



appreciation of the force of their attraction for water. This 



reflection prevented my making experiments on any more ef- 



florefcent falts. - . , 



Deliquefcent Salts. 

 I took 288 grains of each of the falts in the following table, 

 (which are very fenfihly deliquefcent, fince they all abforbed 

 more than half their weight of water), and placed each of 

 them in a dried capfule, along with the before-mentioned me- 

 teorological instruments, in a damp Situation, and after 150 

 days of obfervations noted what is included in the table. 



A Table of Deliquefcent Salts, in ike Order of their Attraction, 

 ejliinated by the Quantity of Water abforbed. 



