animal eesources and fisheries of united states. 245 

 7. Propagation of reptiles. 

 inethods of ferrapiBU cuitiirc. 



8. Propagation of amphibians. 

 inethodfni of fi*o§' culture. 



9. Propagation and culture of fishes.^ 



Acce^sorief^ of obtaining; and iiiipreg'natiiig' ova. 



Pans, paiLs, &c. 



Strait-jackets used in spawning salmon. 



Spawning-race (Ainsworth). 



EoUer spawning-screen (Collins). 



Spawning-vat (Bond). 



Hatchiiig^-apparatiis. 



26940. No. 19. Model of liatcliing-liouse at United States salmuu-breeding 

 station at Buoksport, Me. Scale, :|- inch to the foot (ig). 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. . 



26938. No. 20. Model of hatching-troughs and trays in use at the United 

 States salmon-breeding stations at Buclvsport 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 t9 

 use 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 ujiper 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 hatching-apparatus for black-bass. John Roth, Duncau- 

 non, Pa. 



Brackett's. 

 Williamson's. 

 Clark's. 

 Vats or cases : 

 Holton's. 

 Eoth's. 



• Many of these articles cannot conveniently be exhibited. 



