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most eggs are impregnated, and which are the most healthy 

 or will produce the best fish. In answer to the first ques- 

 tion, we answer that a skillful workman will impregnate 

 more by hand than are impregnated in the natural way. 

 But there are very few such skillful workmen. As the 

 eggs of a Trout are not all ripe at the same time, the unripe 

 ones are lost in hand impregnation ; but then, some are 

 lost also in the screens, by falling upon the gravel and 

 not passing through the wires, and also by being bruised 

 in passing through. To the second question, we answer, 

 that the fish hatched from those rightly impregnated 

 by hand, are just as strong, grow as fast, and live as 

 long as the others. Still, the advantages of Ainsworth's 

 screens, for taking impregnated eggs, especially to a novice, 

 are so great, as to preclude from him all question of arti- 

 ficial manipulation. 



