19 



lips of tlie jars, there being a feed-trough and waste for each 

 row of jars. The jar-frames were about twenty -three feet 

 apart at one end, and they were connected by cross-tanks 

 or troughs, by which the waste water from one side was 

 carried across the house to the feed-trough on the other 

 frame. The large cross-tank on the floor into which the 

 water Anally flowed, and in which the young fish were 

 gathered in hatching-time, was connected with a long tank 

 extending bet\^'een the jar-frames, 48 feet in length, 4 feet 

 wide, and 2^ feet deep. 



In 1888 a hatching-house on the Little Traverse Bay was 

 given up, and its complement of jars were accommodated 

 in the Detroit house, making its number of jars 520 and 

 the house capacity over seventy millions. In 1889 the 

 house was remodelled within by the erection of two addi- 

 tional frames, taking out the central tanks, and making 

 each frame carry four tiers of jars on each side. The 

 number of jars was increased to 1,025, giving the house 

 now a capacity of carrying 150,000,000 white-fish ova. 

 By the new arrangement the storage-tanks for the 

 young fish, four in number, are placed in the wing, or 

 tank-house, the storage-tanks there being connected by 

 siphons to the collecting-tanks in the main or jar-house, 

 for transferring the young fish. 



This house is supplied with a steam-boiler and j)ump. 

 The boiler answers the double purpose of heating in ex- 

 tremely cold weather, and furnishes power for the pump 

 in case of accident to the water supply occasioning a stop- 

 page of water from the city mains ; the pump will lift the 

 water from the tanks on the floor to the upper trough, and 

 use the same water over and over as long as needed. The 

 house is furnished with a stove, and that most necessary ad- 

 junct for ventilation — an open fire. Every hatching-house 

 ought to be provided with a good, large, open fireplace to 

 keep it dry by proper ventilation. There is no provision that 

 can be made for the comfort of the men equal to that. 



