280 K. YAMAGAWA 



The curve is even more free from irregularities than the curve 

 for the first experiment. The same process of calculation was per- 

 formed in order to obtain the values of A^ and A[ ; and they are 

 A,= - 21942.9; A{ = - 12547.G 



And consequently 



ai= - 21.0G4; ß, = 2Q°-i-y-U" 



Calculating from ai we gets for -S'j the value 



o.ooo 



Calculating from ß^ is in the same way as before, we get 

 S, = 3.407 



If we take the mean value of the two, we obtain 



S, = 3.383 

 Then 



The results from the two experiments do not differ from one 

 another by more than If per cent, and the mean value of K from the 

 two experiments is 



ii: = . 00728 



The value, however, differs much from values obtained by pre- 

 vious experimenters, as may be seen from the appended table. 



G. Forbes White marble OOllo 



Péclet Marble 0018 



Depretz Fine-graiued marble^ (density=2.68) .0097 



Ditto Sugar- white, coarse-grained marble 



(density = 2.77) 0077* 



Herschel Marbles, limestone, etc 0047 to .OOÔG 



The second marble experimented upon by Depretz seems to have 

 been very nuich like the marble used in my experiments, and the value 



• See Everett's Physical Constants. 



