PREFACE 



THIS simple book consists of six lectures 

 which I had the honour and pleasure of 

 giving at the Royal Institution in the Christmas 

 holidays, 1920-1921. The aim of these lectures 

 was mainly to help my very alert audience to 

 form vivid pictures of the great haunts of 

 animal life, and to get glimpses of the subtle 

 ways in which living creatures solve the 

 problems of particular places. I have kept in 

 the printed pages as closely as I could to what 

 I said at the time, hoping to secure the virtue 

 of simplicity. I think it would be very un- 

 gracious if I did not use the opportunity of this 

 preface to thank Sir James Dewar, LL.D., 

 D.Sc., F.R.S., for the great kindness that he 

 showed me when I was for a delightful 

 fortnight in the service of the Royal Institution. 



J. A. T. 



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