232 Dr. Andrews .o« the Heat developed 



Temp, of acid, , . . 39°.00 

 ,j alcallne solution , 37°.50 



Mean temp, before mixture 37°.64 

 Temp, after mixture, . . 39°.25 



Increase (31.22 gr. water) . V.Ql 



12. Alcaline solution weighed 27.2 gr., and contained .1765 gr. of pure 

 potash, or double that in the last experiments. Acid solution weighed 2.85, gr. 

 containing .212 anhydrous nitric acid. Ther. in air 39°.5. 



Temp, of acid, . . . 39°.00 

 „ alcfline solution, . 37°.00 



Mean temp, before mixture, 37°. 18 

 Temp, after mixture, . . 40°.40 

 Increase (31.14 water), . . 3°.22 



13. Alcaline solution 26.85 gr., containing .353 potash ; acid liquid 3.25 gr., 

 containing .424 anhydrous nitric acid. Ther. in air 39.3°. 



Temp, of acid . . . 39°.70 

 „ alcaline solutions . 34°.30 



Mean. Temp, before mixture, 34°.86 

 Temp, after mixture, . . 4r.45 

 Increase (31.19 water) . . 6°.59 



14. Reducing these results to the quantity of alcali (.353 gr.) used in last 

 experiment, and to 30 gr. of water, we obtain the following numbers : 



12 3 4 Mean. 



^°.83, 6°.70, 6°.68, 6°.85, 6°.76. 



15. This may be otherwise expressed, by stating that 1 gr. of potash, in 

 combining with nitric acid, is capable of heating 85 gr. of water through 6°.76 

 of Fahrenheit's scale, or, which is the same thing, of heating 574.6 gr. of water 

 through 1°. It must, however, be carefully observed, that in this experiment it 



