PEACTICAL FISH-CULTURE. 587 



enough to protect themselves in the stream below, when they are al- 

 lowed to pass the screen into the open waters. 



The advantages Mr. Furmau claims for his invention are, protection of 

 the eggs and fish from their natural enemies and from sedimentary de- 

 posit and freshets. It has not as yet come into very general use. 



E.— FROG-GULTURE. 



By Seth Green, 



There are many stagnant pools about the country, useless in their 

 present state, and, believing that they should be utilized, I cannot think 

 of any better use for them than to make them into frog-ponds. I believe 

 that the man who could raise a million frogs, and get them to market, 

 would be a rich man. He will find many dififlculties to overcome ; but 

 allowing him two years for experimenting, good results might be antici- 

 pated. 



1. — HOW TO GET THE SPAWN. 



Take a large dipper and go to the pond where the frog casts its spawn. 

 You will find them in a glutinous bunch. When you dip them up, be 

 very careful not to break the glutinous matter which binds them to- 

 gether. Put them in a pail or can, filled with water, and take them to 

 your hatching-box, which is made after the fashion of the shad-hatching 

 box. It is a box two feet long, eighteen inches wide, and a foot deep, cov- 

 ered on the bottom with gas-tarred wire sieving, twelve wires to the inch. 

 Anchor the box in a gentle current. They will hatch in from seven to 

 fifteen days, according to the temperature of the water. 



2. — HOW TO TAKE CARE OF THEM. 



Soon after they are hatched, they should be turned loose in a pond 

 prepared with great care, as they have numerous enemies, such as fish, 

 snakes, birds, lizards, coons, and many other animals. The pond should 

 be made where the ground is springy, and have plenty of soft muck in 

 the bottom. In this muck the frog lies during the winter. The pond 

 should have a tight board fence, so that no animals could get in, and 

 should be built so close to the water that no bird could stand on the 

 ground inside the fence and pick up the poUiwogs. If you do not heed 

 all these precautions, and more too, your young fry will all disappear 

 down the stomach of some bird or animal ; and if you are not an un- 

 usually close observer, you will be in great wonder where they have gone. 



You will have no trouble in feeding the young while they are polli- 

 wogs ; nature has provided for that in all waters. They feed upon 

 microscopic forms found in the sediment. In all waters not impregnated 

 with injurious minerals these forms of life are numerous. Put the sedi- 



