10 



PISH CULTURE. 



tutes, placed closely togetlier, the ends being confined 

 in a sort of rack, made of wood. Each grille is 

 placed in a small earthenware trough, glazed on the 

 inside, this being the best preventive to the growth 

 of confervse. The troughs are placed crosswise in 

 the cistern, and are about six inches wide and four or 

 five deep. A tap at the head of each cistern permits 

 the water to flow slowly over the range of about four 

 or five troughs throughout the cistern, the same jet 

 of water being used only for from four to six troughs. 

 It will be seen that these troughs can, therefore, 

 easily be removed separately for examination. In 



PRENCH TROUGH AND GRILLE. 



the building on the left operations requiring care are 

 carried on. This building also contains brick basins 

 for rearing. AU these processes are carried on within 

 the buildings, and thus extreme frost, or glare and 

 heat of the sun is avoided. 



The ova was formerly collected, by men who made 



