A COURSE 



ELEMENTARY INSTRUCTION 



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. 



L I ,, u 



SECOND EDITION, REVISED, 



r:i-isiTY o 

 VKiF 



MACMILLAN AND CO. 



1876. 



[All Rights reserved.} 



