20 



INTRODUCTION 



American Entomological Company, 1040 DeKalb Ave., 



Brooklyn, N. Y. All kinds of insects. Catalogue 



on application. 

 Brimley Bros., Raleigh, N. C. Living and preserved 



animals. 

 Biological Laboratory, Cold Spring Harbor, L. I., N. Y. 



Marine animals. Catalogue on application. 

 Tufts College Laboratory, South Harpswell, Me. 

 Hopkins Seaside Laboratory, Stanford University, Cal. 



FlG. 5. Dissecting instruments. 



St. Louis Biological Laboratory, St. Louis, Mo. Numer- 

 ous kinds of animals and microscopical slides showing 

 structure of animals. Catalogue on application. 



The Laboratory. This should be a well-lighted room 



