8 



A. C. Hardy 



speed of 2 knots each sample represented a haul covering a distance of one-third of a 

 mile. 



It might perhaps be thought that there was little need for further studies of patchi- 

 ness of the kind here described since the automatic plankton recorder is always taking 



Fig. 1 . Histograms showing the varying numbers of some plankton animals in thirty-two consecu- 

 tive net hauls taken just below the surface at the Discovery station 207; each haul was of 10 minutes 

 duration and covered a distance of one-third of a mile. For further details see text. 



