38 TRANSACTIONS LIVEEPOOL BIOLOGICAL SOCIETY. 



the larger animals and the more powerful swimmers, 

 such as small fish, Amphipods, Schizopods, and Megalo- 

 pas were nearly all caught in the nets at the overflow 

 pipe, and I believe that was due merely to the fact that 

 they swam nearer to the top of the water in the tank. 

 This is an important reason for using the overflow pipe, 

 as well as the ordinary taps leading from the tank, in such 

 pump plankton work. 



The four nets were emptied and re-set regularly twice a 

 day, at sometime between 8 and 9 a.m., and again between 

 6 and 7 p.m. Each gathering represents therefore roughly 

 about 12 hours fishing, or more exactly, the day gathering 

 extended over 10 hours, and the night one over 14 hours. 

 The contents of each of the four nets was examined and 

 entered in the note-book separately, but in a few cases, 

 when there seemed no object in keeping them apart, two 

 or more of the gatherings taken in the same locality and 

 period of time, were preserved in the same bottle. Each 

 day and each night, then, of the voyage is represented in 

 the collection by one or more — sometimes four or five — 

 separate bottlefuls of plankton. 



I may state at once that I saw no marked difference 

 between the day and the night gatherings. It must be 

 remembered, in this connection, that the source of the 

 water was not quite close to the surface, but at least 

 14 ft. down. 



The ''Parisian" left Liverpool about 5-30 p.m. on 

 August 5th, and I fixed my nets so that the water started 

 running through them at 9 p.m. They were examined 

 and emptied at 8 a.m. next morning. This was gather- 

 ing No. 1. Gathering No. 2 was taken in the same way, 

 from 11 a.m. to 3 p.m. on August 6th, as we lay in the 

 mouth of Lough Foyle, near Moville. The nets were 



