8 ELEMENTS OF COMPARATIVE ZOOLOGY. 



will contain almost every zoological term one runs across in 

 most books. Several so-called dictionaries of scientific 

 terms have been published, but as yet not a single one of 

 any value has appeared. 



The teacher should remember that science is continually 

 growing, and that text-books and manuals grow old. He 

 should therefore have access to some of the scientific jour- 

 nals. Among those most valuable to the teacher of natu- 

 ral history are the American Naturalist (Philadelphia) and 

 Natural Science (London). Nature (London) and Science 

 (New York) are weekly publications which include all 

 sciences. 



