ARTIFICIAL BREEDING OF SALMON. 199 



Where water from a spring cannot be directly ob- 

 tained the following plan is often adopted. The scale 

 of operations is, however, necessarily more limited. 

 A large tub, or othe* wooden vessel, is fitted with a 

 tap. Care must be taken that it shall have previously 

 kin a sufficiently long time in water, so that all the 

 deleterious substances from the wood shall have been 

 extracted. It is then placed on a stand at a sufficient 

 height from the ground to allow the case containing 

 the hatching-boxes to be placed beneath the tap ; and 

 they should have a gentle inclination, so that the upper 

 end be about half an inch higher than the lower. 



The water, having passed through the boxes, empties 

 itself into another vessel, at least as large as the tub, 

 and should be so regulated that it shall run out in 

 twenty-four hours. The tub, therefore, only requires 

 replenishing once in that time. If the water be at all 

 muddy, it is well to place a layer of fine sand mixed 

 with charcoal at the bottom of the tub. 



Even in a common tea-saucer a great many ova may 

 be hatched out. 



The saucer is placed in a deep soup-plate, and a 

 couple of moss-stalks laid over the edge in such a 

 manner that they shall act as syphons. A constant 

 flow of water thus takes place from the saucer into 

 the plate. In about twelve hours half the water from 

 the saucer will have run out, so that it will require 



