416 SEE— THE NEW THEORY OF EARTHQUAKES [November i. 



Errata. 



(a) In the paper on the Cause of Earthquakes : 



4400 

 On page 311 the formula for n should read n=^ ~^^ ^= 66^. 



The account of the changes produced by the Valparaiso earth- 

 quake, p. 328, appear to be open to some doubt. Exact data are not 

 yet at hand. This detail of course does not affect the argument in 

 the paper. 



(b) In the paper on the " Temperature of the Earth " : 



Q k— e 

 (i) On page 196 the formula should read Tj/ = t • 



(2) Near bottom of page 196, and middle of page 197, Auwen- 

 dungen should read Anwendungen. 



(3) On page 216, is taken to be Jy ; and the exponential 

 factor is neglected, because it appears in the second power, and for 



a depth of twenty miles is equivalent to e~ (i6)2io2o_^~^and thus nearly 

 unity for t^= 100,000,000 years ; for /= 10,000,000 years, the result 



L I 



is e 2.56 = which would make t still smaller, in the ratio of 



1.48 



nearly 2/3 (0.676). There is therefore a slight defect in the solu- 

 tion for values of t so small as 10,000,000 years ; but as it reduces 

 the time to a still smaller interval, we need not further consider it. 

 The values of t given in the paper on the " Temperature of the 

 Earth " are therefore slightly too large for rigorous solutions of the 

 equations. 



