274 REPORT O^^iOMMISSIOXER OF FISH AND FISHERIES. 



paiiying this report, the location of the priucipal traps and pounds in 

 1871 is indicated. The weirs of Cape Cod Bay are represented on a 

 separate diagram, forming Plate XXXIX of the accompanying illustra- 

 tions. 



Finally, for the purpose of illusttatiug the subject of fish-pounds in 

 the lakes, I give on the following page (Fig. 20) a diagram of the pound- 

 nets erected and worked in 1871 in Lake Michigan, the nets being indi- 

 cated by the short lines drawn perpendicular to the shore-line, in the 

 water surface. A full account of the lake fisheries will be given in the 

 report for 1872. 



tied in the middle ; after beiug weighted -svith bricks or iron the euds of the sheaf are 

 loosely tied ; a rope is attached and the Luudle lowered to the bottom of the water, 

 where it is allowed to remain for a few days, until the fish become accustomed to its 

 presence, after which it may be examined once or twice daily. In good localities the 

 straw in the interstices will be literally crammed with fish. Whether they enter the 

 straw for its warmth or for the friction received in their efforts I am unable to state. 

 The most suitable localities for setting the trap are near wharves or rafts of timber. 



