THE STUDY OF AMPHIBIANS 135 



look at this and similar life-histories from the historical point of 

 view. In a general way, the individual development of the frog 

 is a modified recapitulation, especially as regards stages in 

 the making of particular organs, of the racial evolution of 

 Amphibians. 



BIBLIOGRAPHY. Quoted from O. H. Latter, British Association Report for 1907, 

 p. 547 ; Hans Gadow, "Amphibia and Reptiles," vol. vii. of Cambridge Natural History 

 (Macmillan & Co., London, 1901) ; G. A. Boulenger, Monograph on the Anura (Ray 

 Society) ; A. Milne Marshall, The Frog (Cornish, Manchester) ; St. George Mivart, The 

 Common Frog (Macmillan & Co., London). 



