TKOUT PONDS 107 



larger fish oval cans specially made are the 

 best. 



As an accompaniment to shipping-cans, there 

 must be a device which messengers can use for 

 the aeration of the water while fish are being 

 taken on the railroad journey. The national 

 government and some of the states maintain 

 fish-cars with complete aerating apparatus, but 

 this is not feasible for a commercial establish- 

 ment, and some other means of aeration must 

 be utilized, the best of which is a tin dip- 

 per, with a bowl shaped like that of a milk 

 dipper, with the opening covered with a fine- 

 mesh wire netting, and with a straight han- 

 dle. 



What seems to be the best hand-aerating apparatus 

 yet devised was recently invented by an assistant of 

 Mr. Lydell, Superintendent of the Mill Creek (Michi- 

 gan) State Hatchery. It consists of a cylinder of tin 

 with removable perforated bottoms of different sizes. 

 A valve worked by the finger allows the apparatus 

 to be pressed to the bottom of the can where the valve 

 is released and the cylinder filled with dead water. 

 Another pressure of the finger closes the valve, the 

 cylinder is lifted into the air, and the valve once more 

 released, allowing the water to fall back through the 



