"ROMANCE OF REALITY" SERIES 



HOW ANIMALS 

 WORK 



BY 



F. MARTIN DUNCAN 



F.R.P.S., F.R7M.S. 



LONDON : T. C. & E. C. JACK, LTD. 



35 PATERNOSTER ROW, E.G.; & EDINBURGH 



1919 



JD f 



