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TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



" accumulator." This apparatus consists essentially of 

 two iron rods bound together by strong caoutchouc bands, 

 and fastened to a spar attached to the fore mast. To the 

 under end of the accumulator a pulley is attached, over 

 which runs the rope attached to the net. The elasticity 

 of the caoutchouc regulates the speed at which the net is 



Fig. 5. 



hauled in, and the degree of extension of the caoutchouc 

 bands gives one an idea of the strength of the pull, so that 

 one can avoid the breaking of the rope and the loss of the 

 valuable net. 



The washing down of the plankton into the metal 

 cylinder at the base of the net is important, as when the 



