THE SHIP AND ITS EQUIPMENT 51 



of a few months' duration. But on the other hand a number 

 of problems arose during the cruise, which we would fain have 

 had the opportunity of investigating further. 



It is especially our knowledge regarding the physical and 

 biological conditions in the waters of the abyssal regions, and 

 regarding the large pelagic organisms, that may still be con- 

 sidered as very imperfect. In order to study these problems 

 more effectively, still more powerful winches, longer lengths of 

 wire, and larger and better pelagic fishing gear are the principal 

 things wanted. Future expeditions will thus have to face a 

 serious task, not free from technical difficulties. 



J. H. 



Group of Appliances used on board the "Challenger. 



