LEISURE-TIME STUDIES 



CHIEFLY BIOLOGICAL 

 t$ at fesap snfc ftatarts 



ANDREW WILSON, PH.D., F.R.P.S.E, ETC. 



LECTURER ON ZOOLOGY AND COMPARATIVE ANATOMY IN 

 THE EDINBURGH MEDICAL SCHOOL J LECTURER ON PHYSIOLOGY, WATT INSTITUTION 



AND SCHOOL OF ARTS, EDINBURGH J 



EXAMINER IN BOTANY AND NATURAL HISTORY, FACULTY OF MEDICINE, 

 UNIVERSITY OF GLASGOW, ETC. 



WITH NUMEROUS ILLUSTRATIONS 



CHATTO AND WINDUS, PICCADILLY 



1879 



\_The right of translation is reserved} 



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