SEA-FISHERIES LABORATORY. 



265 



the average 20 minutes. Consequently the numbers 

 recorded for the latter series have been decreased by 

 one-fourth each, after which correction we consider that 

 they are fairly comparable with the others. 



We give here (fig. 8) an unsmoothed curve for the 

 total plankton in the bay throughout the year, which 

 shows well the great spring maximum in April and lesser 

 elevations in June, August and October. When 

 compared with the list of quantities given above for the 



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Fig. 8. 

 total plankton collected daily, or with the curve shown 

 in dotted lines here (fig. 8) for the plankton of the open 

 sea taken by itself in spring and in autumn, it will be 

 noticed that the differences are not very great. The 

 spring maximum is rather earlier in the open sea, and 

 does not rise to such exceptional heights per net. In 

 autumn (August and September) on the other hand the 

 maximum for the open sea is, so far as our evidence 

 shows, rather later than that for the bay, and again it 

 does not rise to such heights. It is possible, however, 

 that the total hauls in the open sea, per net, are kept 



