90 PRACTICAL TROUT CULTURE. 



of an india-rubber bulb (A) about three inches in 

 length by one and a half in diameter. To this is 



FIG. 19. 



attached a curved pipe (B) ; by slightly compress- 

 ing the bulb with the hand, the contained air is 

 forced out, and by placing the nozzle near the 

 dead spawn, and relaxing % the grasp, the egg is 

 driven toward the tip of the pipe, which is hol- 

 lowed for that purpose, and retained in position 

 by the pressure of the external air. Dirt of any 

 kind and dirt will find its way into the boxes 

 spite of all our precautions may be removed in 

 the same manner. On a trial against time, by 

 our superintendent, one hundred and fifty-four 

 dead spawn were removed from a tray in one min- 

 ute with one of these little instruments. 



All who have obtained the least smattering 

 of piscicultural lore are acquainted, at least by 

 name, with the byssus that terror of fish cultur- 

 ists, regarded by them as a devastating blight, 

 a pestilence walking in darkness, an unprevent- 

 able and incurable disease, liable at any time 

 to attack and destroy an entire crop of eggs, 



