4.S 



filtering- tank into tlie reservoir tank ''G. <tt' the capacity of 

 about twelve hundred gallons. Fi(^m this tank the water is^ 

 piped under the floor, which is a Schillenger pavement, to 

 the several hatching troujijhs, and to the tables "'A," in the- 

 octagonal extensions. These pipes are admirably arrange^ 

 witli stoj)-cocks, HO that any portion of the apparatus can be- 

 o])eruted Avithout regai'd to the rest of the building. 



In addition to tlie su])ply from the spring there are pipe* 

 bv means of Avhich an unlimited amount of water can be 

 thrown into the filtering tank or j)onds iVom the high ser- 

 vice reservoir Avhich is on the hill to the west of the hatching'^ 

 house. The water from the reservoir being influenced by the 

 temperature -'f the atmosphere, and that from the spring be- 

 ing invariable, by mixing in different pioportions, Ave can 

 either raise or diminish the temjierature of the water used, at 

 will. The pijies which conduct the water t<> tables ''A," on 

 which the Ferguson Jars are operated, are furnislied witli -^ 

 of-an-inch spickets, over Avhich rubber tubes are slipped, for 

 the purpose of introducing water into the jars. These jars 

 are of glass of the form shown in the annexed cut, which 

 Avas made from a photograph taken when there were in the 

 jar, on the right, between six and seven thousand eggs of the 

 Salmon Trout. In the jars Avill be seen the wire trays on 

 Avhich the eggs are [jlaced, tlie handk- i>f each tray supports 

 the tray next above. 



When the young fisli are free from the egg. they drop into- 

 the bottom of the jar, and can be easily transferred to the* 

 nursery tanks by placing the jar into tlie tank; and by re- 

 moving the cork tlirough which the rubl»er }ti[)e passes, the 

 lish can swim out, or if too inactive, a curieut can be created 

 bv lifting the jar. fSeveral jars can be connected as in the 

 cut, or operated singly if water is abundant. Each jar is- 

 provided Avith a tin cover, a larger cylinder tlian the jar, 

 Avhich excludes the light, and the tables are furnished Avith 

 seventv jars each, making the total capacity of the tAvo tables, 

 nearly one and a-half millions of brook Trout eggs. Through 

 the Avhole extent of the appartment are troughs arranged in 

 pairs, Avhich are provided Avith movable partitions, and can 

 1)6 used as hatching or rearing troughs ; immediately beloAv 

 each pair is another pair which can also be similarly used. 



