120 THE MAIN CURRENTS OF ZOOLOGY 



ifornia, La Jolla, California, and other places. In 

 Great Britain the leading station is at Plymouth, 

 while the marine stations of other European coun- 

 tries are numerous and important. 



The explorations of the abysmal depths and the 

 survey of the sea bottom have resulted in extension of 

 zoological knowledge. These explorations of this 

 character have been carried on by various govern- 

 ment expeditions. The notable voyage of the Chal- 

 lenger (1872-1876), has led to the publication of 

 monumental reports written by the cooperation of 

 zoologists of the different parts of the world. The 

 recent Siboga expedition of Holland and the Harri- 

 man expedition of the United States brought much 

 additional information about sea animals. To this 

 class of voyages belong those on which Darwin (The 

 Beagle) and Huxley (The Rattlesnake) made their 

 trips as naturalists. 



A department of oceanography has been created 

 as a division, chiefly of zoology, and in deep sea 

 investigations Sir John Murray of England and 

 Alexander Agassiz of the United States made notable 

 observations. Albert I., Prince of Monaco, main- 

 tains a station of oceanography on the French coast. 

 This station is splendidly equipped, and important 



