EERATA. 



Page 112 (Mr. Sutherland's paper), in line 28 from top and again in line 30 from 

 top, transpose the words " before" and "after." 



„ 127, line 17. For " the rate of convergence of the series increases in- 

 definitely " &c, read " the rate of convergence of the series diminishes 

 indefinitely " &c. 



„ 240, line 24, for " conservation of natural forces " read u conservatism of 

 natural forces." 



