anbial eesources and fisheries of united states.. 245 

 ^ 7. Propagation of reptiles. 



Methods of terrapin culture. 



8. Propagation of amphibians. 

 JTIetliod!^ of* ii'og^ culture. 



9. Propagation and culture of fishes.^ 



Acce§§or£egi of obtaimoi§^ and ioupreg'nating^ ova. 



Pans, pails, «S:c. 



Strait-jackets used in sj^awning salmon. 



Spawuing-race (Aiusworth). 



EoUer spa\\Tiiug-screen (Collins). 



Spawning-vat (Bond). 



Hateh!ra^-apparatu§. 



26940. No. 19. Slodel of hatclimg-liouge at United States salmon-breeding 

 station at Bucksport, Me. Scale, i inch to the foot (/s). C. G. 

 Atkins. 



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

 Lvulding, 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. 



26933. No. 20. Model of hatching-troughs and trays in use at the United 

 States salmon-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 

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

 Scale, full size. C. G. Atkins. 

 The eggs are iilaeed on all of the trays exceijt the upper one. 

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

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

 fines the trays securely in place. 

 26970, Model of hatching-ajiparatus 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. 



