400 
BULLETIN OF THE BUREAU OF FISHERIES 
augmented similarly in volume at the mouth of Massachusetts Bay from less than 
5 cubic centimeters on March 1 (station 20050) to at least 200 cubic centimeters on 
April 9 (station 20090), while Fritz (1921) records the numbers of diatoms per haul 
Fig. 108. — Volumes of phytoplankton (in cubic centimeters) per standard surface haul in February and March, 1920. The 
hatched curve incloses areas with more than 50 cubic centimeters; the stippled curve with more than 250 cubic centi- 
meters 
as increasing from about 28,000 on March 15 to upwards of 9,000,000 on May 1 at 
St. Andrews. 32 When the water is cloudy with diatoms, as is the usual state when 
SJ Fritz’s counts are for the catches of horizontal hauls that fished through an unmeasured volume of water. 
