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

 several liatehing troughs, and to the tables "A," in the 

 octagonal extensions. These pipes are admirably arranged 

 with stop-cocks, so that any portion of the apparatus can be 

 operated without regard to the rest of the building. 



In addition to the supply from the spring there are pipes 

 by means of which an unlimited amount of water can be 

 thrown into the fliltering tank or ponds from the high ser- 

 vice reservoir which is on the hill to the west of the hatching 

 liouse. The water from the reservoir being influenced by the 

 temperature of the atmosphere, and that from the spring be- 

 ing invariable, by mixing in difterent proportions, we can 

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

 will. The pipes wirich conduct tlie water to tables "■'A," on 

 wdiich the Ferguson Jars are operated, are furnished with §- 

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

 the ]nirpose of introducing water into the jars. These jars 

 are of glass of tlie form shown in the annexed cut, wliich was 

 made from a photograph taken when there were in tlie jar, on 

 the right, between six and seven thousand eggs of the Salmon 

 Trout. In tlie jars will be seen tlie wire trays on Avhich the 

 eggs are placed, tlie handle of each ti-ay supports tlie tray 

 next above. 



When the young flsh are free from the egg, they drop into 

 the bottom of the jar, and can be easily ti'ansferrcdto the nur- 

 seiT tanks by placing the jar into tlie tank; and by removing 

 the cork through which the rubber pipe passes, the fish can 

 swim out, or if too inactive, a current can be created by lilt- 

 ing thy jar. Several jars can be connected as in the cut, or 

 operated singly if water is abundant. Each jar is provided 

 with a tin cover, a larger cylinder than the jar, which ex- 

 cludes the light, and the tables are furnished with seventy 

 jars each, making the total capacity of the two tables, neaidy 

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

 whole extent of the apartment are troughs arranged in jiairs, 

 which are 2)rovided with movable partitions, and can lie 

 used as hatching or rearing troughs; immediately below each 

 paii^" is another pair which can also be similarly used. The 

 accompanying cut shows the manner in which the water is 

 introduced and taken away. They are admirablv arranged 



