LITERATURE 



Only the merest outline of a guide to the literature 

 of the subject can be given here. A general view of 

 terrestrial phenomena, " popularly " written but 

 scientifically sound, is furnished by Dr. H. R. Mill's 

 " Realm of Nature." Further, Wyville Thomson's 

 " Depths of the Sea," Alcock's " Naturalist in Indian 

 Seas," Moseley's " Notes by a Naturalist on H.M.S. 

 Challenger," and " Three Cruises of the Blake," by 

 Agassiz, supply accounts of typical expeditions which 

 are excellent and valuable reading. In Kriimmel's 

 " Handbuch der Ozeanographie " we have a textbook 

 of pure oceanography (excluding zoology and botany), 

 written with a thoroughness and wealth of detail truly 

 Teutonic, but suitable only for somewhat advanced 

 students. 



From these we have to plunge almost at once into 

 the more technical monographs. As a rule the most 

 valuable are those of the more recent expeditions — the 

 " National " or Plankton Expedition (North Atlantic 

 Ocean), the " Valdivia " (Atlantic and Indian Oceans), 

 the " Siboga " (East Indies), and the " Belgica" (Ant- 

 arctic) — but many of the " Challenger " Reports are 

 still indispensable. The majority of these are zoological 

 and botanical reports, but there are also volumes dealing 

 with chemistry, physics, meteorology, and equipment. 

 The monographs of the Naples Station are the best 

 guide in some groups. Once the observer has selected 



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