62 On Stocking. 



below 32 Fahr., this suggestion may also explain 

 the movement of herring shoals, and ultimately 

 furnish some guide to the depth nets should be 

 sunk for successful fishing. It may be advisable 

 to experiment to ascertain the laws and conditions 

 under which a rapidly cooled layer of salt water 

 could pass through the immediate infraposed 

 layers. 



THE CULTIVATION OF WATER 



A piece of water can be cultivated so as to yield 

 results which can only be compared to a market 

 garden or to a vineyard. 



Probably the larger lakes will always in this 

 country be more valuable for sporting purposes 

 than as food producing waters ; as trout preserves, 

 than as trout farms. Their cultivation as pre- 

 serves will consist of careful and systematic 

 netting, to remove all trout destroyers, such as 

 pike, perch, and above all, old large-headed, lanky- 

 bodied, barren trout ; of the introduction of fresh 

 blood when desirable ; and of stocking with such 

 discretion that the average size of the trout 

 caught with the rod be not below the desired 

 minimum. 



The introduction of water-plants and of natural . 

 foods, for even the May fly may be successfully 

 transplanted while in the caddis state, and 

 in some cases the planting of timber, to shelter 



