N 



atural History 

 Studies 



By 

 J. ARTHUR THOMSON, M.A., L L.D. 



Regius Professor of Natural History in the 



University of Aberdeen 

 Author of "Secrets of Animal Life," 

 " The Biology of the Seasons," etc. 



ANDREW MELROSE, LTD. 

 LONDON & NEW YORK, 



v 



