ii8 THE MAIN CURRENTS OF ZOOLOGY 

 

 crops, fruit and shade trees. In response to this 



practical need, the researches on structure, habits, 

 life history, development, conditions of life, etc., of 

 insects have been greatly increased. A host of 

 specially trained observers, widely distributed over 

 the country, have produced important economic re- 

 sults which at the same time have greatly advanced 

 zoological knowledge. The Bureau of Entomology 

 at Washington has been the center promoting this 

 kind of investigation and the results have been 

 characterized by accuracy and scientific production 

 of a high order. Some states and cities have well- 

 organized departments for carrying on observations 

 of this nature. 



Marine Zoology. The investigation of marine life 

 has been greatly developed by exploring expeditions 

 and by the establishment of seaside stations. The 

 most famous of these is the international research 

 station at Naples (Stazione Zoologica) founded by 

 Anton Dohrn in 1872. Tables and rooms for re- 

 search in this station are maintained partly by the 

 cooperation of universities and learned societies of 

 the world. Researches carried on at the station are 

 by no means confined to marine zoology, but the 

 marine forms that are so abundant in the gulf of 



