COURSE OF 

 ELEMENTARY INSTRUCTION 



IN 



BY 



r, H. mix 



T. H. HUXLEY, LL.D., F.R.S., 



ASSISTED BY 



H. N. MARTIN, M.A., M.D., D. Sc., F.R.S. 



EDITION 

 EXTENDED AND EDITED 



BY 



G. B. HOWES, 



ASSISTANT PROFESSOR OF ZOOLOGY, ROYAL COLLF.GE OF SCIENCE, LONDON, 



AND 



D. H. SCOTT, M.A., PH. D., 



ASSISTANT PROFESSOR OF BOTANY, ROYAI. COLLEGE OF SCIENCE, LONDON. 



WITH A PREFACE BY 

 PROFESSOR HUXLEY, F.R.S. 



21 on ton 

 MACMILLAN AND CO., LIMITED 



NEW YORK : THE MACMILLAN COMPANY 



1898 



