200 



PROFESSOR FORBFS'S RESEARCHES ON HEAT. 



Dark Hot Buass. March 31. 1838. 



Incandescent Platinum. February 10. 1838. 



Heat from Locatelli Lamp sifted by a plate of Alum. March 31. 1838. 



averages and ratios taken, generally on the same day on which they were made. This methodical plan 

 cannot be too strongly recommended. Much after anxiety is spared, the calculations are lightened, 

 errors avoided in the reduction after minute circumstances have been forgotten, and suggestions are 

 afforded by the result of past experiments for the conduct of new ones. 



