A COURSE 



OF 



PKACTICAL INSTKUCTION 



IN 



ELEMENTARY BIOLOGY 



BY 



T. H. HUXLEY, LL.D., Skc. E.S., 



ASSISTED BY 



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



FELLOW OF CHKIST'S COLLEGE, CAMBRIDGE. 



Hontion : 

 MACMILLAN AND CO. 



1875. 



[All Bights reserved.} 



