Solutions of "various salts compared 319 



624] Comparison of water purged of air by boiling and plain water. 

 Jan. 12. Salt in 2999 in tube 12. Salt in 150,000 in tube 20. 

 Tube 20 . 12 Electrometer = 4^. Th. = 50. 



1-2 plainly greater. 



1-4 seemed greater, but doubtful. 



1-8 seemed less, but doubtful. 



2-0 plainly less. 



The water was then boiled over lamp in the same vial in which it had been 

 kept some time, and then cooled in water and compared in the same manner. 



2-0 sensib. less. 



1-8 seemed less, but doubtful. 



1-2 seemed greater, but doubtful. 



i-o plainly greater. 



Therefore if anything water conducted better before boiling than after, but 

 the difference might very likely proceed from the error of the experiment. 



In order to see whether the water had absorbed much air by being exposed 

 to the air in the trial, some of the boiled water was exposed to the air as much 

 as that which was tried in the tube was supposed to have been, and boiled over 

 again in a vial. It did not begin to discharge air till it was heated to 190, and 

 then discharged but little. Some more of the boiled water which had not been 

 poured out of the vial seemed to discharge as much air. But some distilled 

 water which had not been boiled began to discharge air almost as soon as heated, 

 and discharged a great deal before it began to boil*. 



625] Comparison of water impregnated with fixed air and plain water. 



Some distilled water was impregnated with fixed air produced by oil of 

 vitriol and marble, and compared with salt in 2999 in same tubes and manner 

 as in former experiments. 



Electrometer = 4^. Th. = 55. 



1-6 



1-4 



2-4 



2-6 

 2-8 



seemed greater, but doubtful. 



plainly greater. 



not sensibly less. 



sensibly less, scarce doubtful. 



plainly less. 



The same water deprived of its fixed air by boiling, and tried as before. 

 Tube 20 



1-2 

 i-o 



9 

 6 



7 



12 



[See Art. 692.] 



plainly less. 



sensib. less. 



seemed less, but doubtful. 



plainly greater. 



not sensib. greaterf. 



t [See Art. 693.] 



