254 PROCEEDINGS OP THE AMERICAN ACADEMY. 



ume and exposed surface, as well as of heat capacity of the contents of 

 the calorimeter in each case. Whether the change of capacity is 

 sufficient to demand allowance can be usually determined by inspec- 

 tion of the case, and a special method of treatment provided. The 

 usual effect is to make the apparent value of r^ smaller relatively to r^ 

 than would correspond to Newton's law. 



Rogers Laboeatokt of Physics, 



Massachusetts Institute of Technology, 



Bostou, May, 1895. 



