RISE OF COMPARATIVE ANATOMY 



159 



the wing of a bat and the foreleg of a dog. Analogy is a 

 superficial, and often a deceiving relationship; homology is 

 a true genetic relationship. It is obvious that this distinction 



FlG. 44. LACAZE-DUTHIERS, 1821-1901. 



is of great importance in comparing the different parts of 

 animals. He made a large number of independent discov- 

 eries, and published a monumental work on the comparative 



