SEA-FISHERIES LABORATORY. 



199 



six samples in the week. The twelve months in 1911 are 

 represented as follows : — 



Each month is thus represented by a considerable 

 amount of material, the average per month being about 

 26 hauls. The lowest monthly records are 18 for 

 February and 22 for October, and the highest, 31 for 

 April and June. It has to be added that in April, 

 August and September additional material, obtained 

 from the " Runa " outside the bay, is also available for 

 comparison. 



Treating these records in the same way as in previous 

 years and comparing the results we find that : — 



(1) The monthly averages for the horizontal nets 



are not quite so large as those of last year. In 

 1910 the highest was 63 c.c; in 1911 it was 

 46 c.c. 



(2) The maximum was reached a month later — in 



May in place of April. If we analyse this 

 maximum into its three most important 

 constituents, we find that in 1911: — 



The Diatom maximum was in May. 



The Dinoflagellate maximum was in June. 



The Copepod maximum was in July. 



The vertical hauls at the mouth of the Bay, as on 

 previous occasions, agreed well in their evidence with 

 the much larger bulk of material obtained from the 

 horizontal nets. The maxima in the vertical hauls were 

 at the times stated above and the quantities were : — 



In 1910 (April and Mayj about 4 c.c. per haui. 

 In 1911 (May and June) about 5 c.c. per haul. 

 o 



