ANIMAL RESOURCES AND FISHERIES OF UNITED STATES. 243 



With rectangular compartmeuts. 



I 



28937. Model of rectangular compartment fish-way on the inclined-plane 



system, in an extended arrangement. Scale, i incli to the foot 

 U^). C. G. Atkins. 



Spiral fish-ways. 



26949. No. 11. Model of rectangular compartment fish-way on the inclined- 

 plane system, in spiral arrangement, devised by Charles G. Atkins, 

 of Bucksport, Me., in imitation of Pike's spiral fish-way. Scale, -J 

 inch to the foot {i%). C. G. Atkins. 



This model represents a fish- way precisely the same capacity and 

 slope, and adapted to a dam of the same height as No. 10, 

 showing the great economy of space and material effected by 

 the spiral arrangement. Further advantages of the spiral 

 arrangement are the facility with which water can be admitted 

 at different heights of the river, and contiguity of the outlet 

 to the dam secured, so that the fish will readily find it. 

 26931. Model of Pike's spiral fish- way, devised by Hon. R. G. Pike, of Con- 

 necticut. Sale, I inch to the foot (2^4). C. G. Atkins. 



The advantages of this, the first spiral arrangement invented in 

 America, are the same as those claimed for that arrangement 

 in Pike's spiral fish-way. 



Moving float fish-ways. 



26930. Model of Everleth's fish-way, devised by F. M. Everleth, M. D., of 

 Waldorboro', Me. Scale, i inch to the foot (cs). C. G. Atkins. 

 The peculiarity of this fish-way is the movable attachment at the 

 upper end, which, by its own buoyancy, rises and falls with 

 the fluctuations of the river, thus insuring that the entrance 

 shall always be at the right height to admit the requisite 

 quantity of water. 



^^^From natural enemies. 



Apparatus Tor destroying injurious species. 



Oyster-bed tangles. (See under B, 12.) 



Tethers and hopples. 

 Cag"es and pens. 



Kennels for dogs, «&c. 

 Cages for animals. 

 Cages for birds. 

 Cages for insects. 



JJG31. Cages for fire-flics. West Indies. Miss Septimia Randolph. 



