A COURSE 



OF 



ELEMENTARY INSTRUCTION 



IN 



PRACTICAL BIOLOGY 



BY 



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



ASSISTED BY 



H. N. MARTIN, B.A, M.B., D.Sc. 



FELLOW OF CHRIST'S COLLEGE, CAMBRIDGE. 



NEW EDITION. 



Uonfcon : 

 MACMILLAN AND CO. 



1879. 



[The Right of Translation is reserved.] 



