140 PROCEEDINGS OF THE AMERICAN ACADEMY 



f{v) from them. That determination must form the subject of a sub- 

 sequent paper. We will simply present here a specimen of our exper- 

 imental results for both the rod and the plate, heated at one point 

 under the conditions above specified; the values in column "w" being 

 galvanometer deflections : — 



Rod. Plate. 



From these series we are to determine w as a function of r. If v 

 =■ q){r). Then for a rod, f(f{r) = Ar -\- B ; for a plate, /g(r) = 

 C^Blog r. 



Permit us here to express our great gratitude to your Academy for 

 the generosity and liberality which have supplied us with the means for 

 carrying on our experiments. 



Harvard University, Oct. 10, 1877. 



