318 American Fisheries Society 



saw of the kind already made, and that it is on sale somewhere; it has 

 teeth on but one side, and in order to make a doubled-edged saw it is 

 turned over, while hot, every six inches. 



Mr. Fearing: A man named Ziemsen advertises it in the London 

 Fishing Gazette. 



Mr. Meehan : There was an exhibition of a machine similar to that 

 at the Toledo meeting in 1909. The demonstration was made in an 

 artificial stream at the Castalia Club. It was quite successful. I have 

 sympathized a great deal with Mr. Worth because the method he pur- 

 sued in raking and hauling is what we have had to do ourselves, to 

 keep our ponds clear of the chara moss. 



Mr. Bfown : I would like to ask Dr. Bean if this Simulium must 

 have rippling water, or a current in which to propagate, as Dr. Forbes 

 mentioned? 



Dr. Bean: Xo, it propagates in the pond, which is the ordinary 

 pond with an inflow and outflow. It is true there is a good flow of 

 water through it. but it does not make ripples on the surface. We have 

 put nothing in to cause ripples, and yet in the ordinary bass and crappic 

 ponds this Simulium develops in enormous numbers. 



