134 FISH CULTURE. 



dantly in most of our rivers, and it is possible that 

 some of them may even contain pearls. 



The culture of Leeches is largely practised upon 

 the -Continent, and handsome profits are yearly 

 realized by it. The best leeches come from the 

 south of France, from Italy, and Hungary. It is 

 doubtful whether our climate is not too cold for 

 successful Hirudiculture. To those who wish to 

 study this subject I recommend the work of Mons. 

 Jourdier. 



