A COURSE OF 

 ELEMENTARY INSTRUCTION 



IN 



PRACTICAL BIOLOGY 



BY 



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



ASSISTED BY 



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



REVISED EDITION 

 EXTENDED AND EDITED 



BY 



G. B. HOWES, 



ASSISTANT PROFESSOR OF ZOOLOGY, ROYAL COLLEGE OF SCIENCE, LONDON,, 

 AND 



D. H. SCOTT, M.A., Ph. D., 



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



WITH A PREFACE BY 

 PROFESSOR HUXLEY, F.R.S. 



laniron : 



MACMILLAN AND CO. 



AND NEW YORK. 



1892 



[All Rights reserved.'] 



