ANIMAL RESOURCES AND FISHERIES OF UNITED STATES. 245 



7. PROPAGATION OF REPTILES. 

 Ittethod* of terrapin culture. 



8. PROPAGATION OF AMPHIBIANS. 

 Ittethods of frog 1 culture. 



9. PROPAGATION AND CULTURE OF FISHES. 1 



Accessories of obtaining- and impregnating ova. 



Pans, pails, &c. 



Strait-jackets used in spawning salmon. 



Spawning-race (Ainsworth). 



Boiler spawning-screen (Collins). 



Spawning-vat (Bond). 



Hatching-apparatus. 



26940. I\ T o. 19. Model of hatching-house at United States salmon-breeding 

 station at Bucksport, Me. Scale, inch to the foot (4^). C. G. 

 Atkins. 



The hatching-troughs are arranged in sets of four across the 

 building, and fitted with Brackett trays. The water enters 

 them from a feed-trough along the side of the room and es- 

 capes by pipes through the floor. 



Troughs : 

 Plain. 



Gravel-bottomed. 

 With sieve-bottom trays. 



5. No. 20. Model of hatching-troughs and trays in use at the United 

 States sulmon-breeding stations at Bucksport and Grand Lake 

 Stream, Me. Scale, full size. C. G. Atkins. 



The eggs to be hatched are placed on the wire-cloth trays. 

 26935. Model of hatching-frame in use at Grand Lake Stream, adapted to 

 nse in a trough or in an open stream. Devised by C. G. Atkins. 

 Scale, full size. C. G. Atkins. 



The eggs are placed on all of the trays except the upper one. 

 The interstices, though too small for the escape of the eggs, 

 permit a change of water, and when the frame is shut it con- 

 fines the trays securely in place. 



26970. Model of hatchiug-apparatus for black-bass. John Roth, Duncan- 

 non, Pa. 



Brackett's. 

 Williamson's. 

 Clark's. 

 Vats or cases : 

 Holton's. 

 Eoth's. 



1 Many of these articles cannot conveniently be exhibited. 



