THE NEW AKT OF BREEDING FISH. 87 



About the same period, a German naturalist, 

 Jaoobi, published at Hamburg an equally interesting 

 letter upon the art of bringing up salmon and trout, 

 and on the production of these fish by means of arti- 

 ficial fecundation. At a later date analogous experi- 

 ments were made in Scotland by Dr. Knox, Mr. 

 Shaw, and Mr. Andrew Young. In 1835, Signer 

 Eusconi, so well known among naturalists by his 

 work on the embryology of salamanders, published 

 in the seventy-ninth volume of the Bibliotheca Itali- 

 ana, new observations on the development of fish, 

 and gives equally instructive details in artificial fe- 

 cundation of the eggs of the tench and the ablette. 

 At my suggestion, the translation of this memoir was 

 inserted in the Anncdes des Sciences Naiurelhs, pour 

 1836. 



I would add, too, that it was by recourse to this 

 method of multiplication that Messrs. Agassiz and 

 Voght procured all the embryos necessary for their 

 studies on the development of -the palde, a species 

 of salmon of the Swiss lakes, the anatomical history 

 of which these two naturalists published in 1842. 

 The philosophical fact, then, upon which M. de 

 Quatrefages relied to stimulate agriculturists to the 

 manufadiuring of fish, in the same way they produce 

 grain or meats, offered nothing new to zoologists, 

 and to their remembrance M. de Quatrefages was 

 the first to recall the claim of Goldstein as the dis- 

 coverer of artificial fecundation. But under our sys- 

 tem of education, truths well known by naturalists 



