in various Substances. 



point o, that is to say, till they had acquired exactly 

 the temperature of the cold mixture ; and then taking 

 them out of it I plunged them suddenly into a large 

 vessel of boiling water, and observed the time required 

 for the mercury to rise in the thermometers from ten 

 degrees to ten degrees, from o to 80, taking care to 

 keep the water constantly boiling during the whole of 

 this time, and taking care also to keep the instruments 

 immersed to the same depth, that is to say, just so deep 

 that the point o of the inclosed thermometer was even 

 with the surface of the water. 



These experiments I repeated twice with the utmost 

 care; and the following table gives the result of them. 



