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PROCEEDINGS OF THE AMERICAN ACADEMY 



fluid, which still clung to the wire. It will be seen that the geomet- 

 rical form of the curve is the same for all of the temperatures, and 

 even when the substance has been converted into the liquid state. 

 These curves are the graphically constructed means of the experi- 

 mental curves, as in Plate II. 



TABLE III. 



B line 11.23 



D line 12.45 



E line 13.86 



The mean of the eighteen series of experiments is given also in 

 Plate IV. and Table III. ; all, of course, being reduced to the same 

 value of the maximum ordinate. In fact, all of the curves of this 

 plate are reduced in this way for convenience of comparison of their 

 forms ; their absolute size being unimportant, as no measurements of 

 temperature were made except in the case of platinum. The curves 

 are, of course, all reduced to the same sun spectrum, so that any of 

 their parts are strictly comparable. 



