BIOLOQY 



UBRARY 



G 



PRINTED BY C. J. CLAY, M.A. AND SONS, 

 AT THE UNIVERSITY PRESS. 





First Edition 1876. Second Edition 1877. 

 Third Edition 1879. Fowr/i jBdt*ton 1883. 

 Reprinted 1884, 1886. Jft/tfc Edition, 1890. 



