400 NATURAL SCIENCE. Nov., 1894, 



search for fruits, and have eaten the dead body. Judging from our present 

 animals, the change from a vegetable to an animal diet must have been very easy. 

 Most of our frugivora, as squirrels, etc., will eat insects, and not unfrequently 

 prefer them. 



I have supposed the change to have taken place in the Glacial Period, but 

 obviously this is not essential. The essential points are, (i) fierce struggle for 

 existence, (2) liability to sudden attack, (3) recourse to trees cut off. 



Most probably this hypothesis will prove untenable on criticism, but I think I 

 have shown that the erect posture is not an insuperable stumbling-block, that at 

 Jeast it is possible to imagine ways in which it might have come about. 



6 Harrington Street, Dublin. J. R. Holt. 



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