27 



SPECIFICATIONS OF " THOROUGH VASE. 



" The outer casing can be an ordinary wooden tub, one three 

 feet in diameter will hold 10,000 fry. The supply pipe to be 

 one-half inch lead composition, to be fixed three-quarter inch 

 away from inside of tub. This pipe to be perforated about 

 every four inches with very fine holes, which must be at an 

 angle as shown ; the water as it enters this tub is forced round 

 and round and the fish are in a small trout stream ; the food is 

 also kept in suspension by the circular motion. 



" The guard cylinder is tacked to the bottom of the tub by a 

 small flange. This cylinder is made with zinc, but the bottom 

 four inches is perforated zinc, the waste water, dirt, etc., passes 

 through the perforations. 



" The standing waste to be one and one-quarter inch lead 

 pipe, the top slightly bell-mouthed, the bottom soldered to a 

 brass piece with ground face, which fits into a brass fixture 

 standing up one inch from bottom of tub with corresponding 

 ground face. 



" In washing out pull up the standing waste and with a 

 feather stir up the bottom of tub and away goes the sediment 

 down the waste. You seldom want to do this with care in feed- 

 ing, not to give too much at a time. 



" Remember that the entire invention depends upon the 

 holes in circulating supply pipe being pierced at the proper 

 angle." 



Mr. Mather said that all his trout were distributed or put 

 out in the rearing ponds and he could not try this method the 

 present year, but it may be worth while for others to do it. In 

 1880, when on the stafi" of Prof G. Brown Goode, in charge of 

 the American department at the fisheries exhibition in Berlin, a 

 gentleman from Baltimore, whose name he had momentarily 

 forgotten, sent some glass models of the Bell and Mather shad 

 hatching cones which were designed to keep the food in sus- 

 pension, just as the shad eggs are, and some fry were fed in the 

 cones for a while, but not long enough to test the system of 



