COREGONUS LAVARETUS AND FERA. 267 



In acclimatizing this fish, the French do not send the 

 ova from Huningue with the embryo developed, as they 

 do all the other ova, because the eggs are so small as to 

 render manipulation difficult. They, therefore, send them 

 out as quickly as possible after they are taken, and request 

 that they may be immediately distributed. They advise 

 them to be sown, like grain (thrown broadcast as it were), 

 in the shallow shores of lakes and ponds. If hatched 

 in confinement, they should be placed on a bed of weeds 

 partially submerged : they need not be plunged in the 

 water themselves. When hatched, the young do not 

 remain helpless at the bottom for five or six weeks, like 

 the other Salmonidse, but swim at once on the top : they 

 should then be immediately set at liberty. If kept in 

 confinement, their food (liver) should be ground to dust 

 and cast upon the surface of the water. Such are the 

 directions sent forth in respect to the Fera. 



Of course, where varieties caused by waters and locality 

 are as plentiful as the lakes ; where the distinctive dif- 

 ferences between the fish themselves are but small, and 

 where names are legion, as in the above description, the 

 confusion is so great that nothing but the utmost patience 

 and perseverance, combined with large opportunities and 

 the staunchest assistance, can ever hope to settle such moot 

 points as these questions of the identity of some fish with 

 others. The Coregoni are, therefore, as yet very much 

 unexplored and debatable ground with naturalists. 



THE END. 



