ADVANCED ARITHMETIC 93 



,^j Mark ? " Answer : " 15." Towards the close 

 of 1916 I taught her to raise numbers to various 

 powers. At this she was slow in the beginning, but 

 ultimately mastered it fairly well. She could soon 

 answer such questions as " 3 3 = ? " with "27." 

 And " 4* = ? " with " 16," doing so, moreover, with 

 ease ; but up to now I have not been able to take her 

 any further in the matter of extracting roots ; in the 

 first place I have had little time to give to it, and 

 secondly, I am by no means on very sure ground there 

 myself ! I might, of course, have rubbed up my own 

 rusty arithmetic had my interest in this particular 

 accomplishment of Lola's been greater. But for 

 my own part, I attach greater importance to the psy- 

 chological side of this question, and would far rather 

 probe and delve within the depths of her dog-soul, 

 exploring the extent of her other abilities, since 

 arithmetic has already some brilliant exponents in, 

 for instance, Krall's horses. 



