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water-supply was duly tested by Mr. Charles Estcourt, the 
Manchester City Analyst, and the present President of the 
Association, and was pronounced eminently suitable for the 
purpose. It is conveyed through lead pipes a distance of 
65 yards from the cistern before-mentioned to the house, 
and as there is a descent of from 10 to 12 feet, or say 1 in 
16, from the cistern to the hatching tanks, a good pressure 
is secured. The troughs and trays were made at Bowdon 
under the superintendence of the authorities of the Bollin 
fish-house. The annexed plan shows the arrangement. The 
water first enters a filter-box (A) supplied with loose gravel, 
and then passes into a long trough (B). This trough is 
connected with six trays over tanks on the left hand side 
of the plan, arranged in the form of steps, over which the 
water successively flows, escaping by the waste pipe (D). 
On the right hand side is another series of trays also ar- 
ranged in three series of steps independently supplied with 
a constant flow of water from the trough, and with a waste- 
pipe also marked (D). The trays are supplied with the 
usual glass-rod grills, the ova being placed on the rods, and 
each tray is calculated to hold 1500 trout eggs. As the fish 
are hatched they escape through the grills into the boxes 
or tanks. The bottoms of the tanks are covered with fine 
gravel in which the young fish take refuge from the light. 
Small pieces of slate are mingled with gravel, and under 
these the fish find what appears to be often a very welcome 
shelter. On the right of the door a large zinc tank has 
been provided, and into this the fish are removed as they 
increase in strength. Provision is, of course, made for a 
continual flow of water through it. The water, though 
roughly filtered, still appears to contain a considerable 
natural supply of food; indeed, as Dr. Angus Smith has 
shown, even very pure spring water is abundantly supplied 
with microbia. It would be interesting to ascertain how 
