1830 SALLY 253 



A and B are two sections of a sexually segregating 

 species. 



I have written thus at length, because I am 

 anxious to prevent loggerheads in print from absence 

 of clear understanding of each other's views. If, 

 after considering the matter in the light I have 

 endeavoured to present, you still fail to agree, please 

 say why ; and in any case believe me to remain, 



Always your 



Philosopher. 



Please return this letter, as it may be of use 

 in answering your next — you marking it to avoid 

 quoting. 



Another bit of work was an investigation into 

 the intelligence of the chimpanzee ' Sally ' at the 

 Zoological Gardens, which the following letter de- 

 scribes : 



SAVAGE versus BRUTE. 



To the Editor of the ' Times ' (Sept 19, 1888) 



Sir, — In connection with the correspondence on 

 the powers of counting displayed by savages, it 

 may be of interest to narrate the following facts 

 with regard to similar powers as displayed by 

 brutes. 



One often hears a story told which seems to show 

 that rooks are able to count as far as five. The 

 source of this story, however, is generally found to 

 have been forgotten, and therefore the story itself is 

 discredited. Now, the facts stand on the authority 



