BIGELOW: EXPLORATIONS OF THE COAST WATERS. 



311 



Gulf of Maine have shown that it is usually more or less stratified. 

 In 1913 the greater part of the plankton was condensed in the upper 

 100 meters or so; and while no such general rule can be laid down for 

 1914,because sometimes the deeper haul (Stations 10215, 10246, 10248, 

 10254), sometimes the shallower (Stations 10214, 10233, 10249,) yielded 



TpES"^ 





Fig. 92. — Plankton volume per cubic meter, July-August, 1914. 

 5, very rich 1 + cc. per cubic meter 



4, rich . 6 + cc. " , 



3, Intermediate . 3 — . 6 cc. 

 1, scanty .3 — cc. 



the largest catch when two subsurface hauls were made at different 

 levels, usually one was much larger than the other, as illustrated by 

 the following table of catches in the horizontal hauls, reduced to a 

 column 1 square meter in cross section. Duration of hauls, ^ hour. 

 The depth is the level at which the major part of each haul was 

 made. 



