CHAPT. xxn. Protecting the Overflow. 



less, in this manner does no practical harm, for their name is 

 legion. 



A point "ii behalf of the fry, which is bj do means to be 

 neglected, is, however, the overflow. The tendency of fry is to go 

 downstream; when, therefore, you have a heavy rainfall, and a 

 decided overflow, their natural instincts will impel them all to 

 follow it out of your pond, and so you will lose them. Tiny will 

 moot in shoals. The first idea that occurs to one is to bar 

 their way with a grating. But a grating that will prevent the 

 passage of fry must be very fine indeed, and such a grating on the 

 surface is liable to be very sunn choked with the debris that always 

 floats down with a flood. Let A B be a section of your bank, and 

 A the point of overflow, A II the outfall. You will, of course, be 

 guided by circumstances in the amount of 

 height you allow at A C for overflow, 

 and in diminishing its height and force 



O O - - — 



by lengthening it. Bun out a plank C D 

 V. 1 one foot or more, continuing E F 2 

 feet or more below the surface of the 

 water, at the lowest level of the outfall. 

 At F <i have a fine wire grating. Then any debris floating 

 down towards the overflow must necessarily come against the 

 ] plank at the surface of the water at E, and the grating F G 

 is left clear and unchoked for the flow of water, and F G being 

 well below the surface, the draught of water is not enough to 

 ■ome the buoyancy of the debris, and draw it down so far. 

 Similarly the instinct of the fry is to escape by the surface, never 

 by the unnatural course of the arrow, and if any stray curious one 

 should accidentally find the unusual nutlet, yon have a fine wire 

 grating F G. If the pond be a small one, and the overflow slight 

 A ( 1 15, instead of representing the bank, may be a pipe let through 

 the bank as a syphon, and lead anywhere into the pond, and sur- 

 rounded by a box, K I DF, as shown in dotted line. If the 

 overflow be considerable, the strength of it may be minimized by 

 breadth, and C D E F may be formed of masonry, 

 and at any slope, and turfed over for appearance sake. 



Fish breed much more rapidly in I m lit than in England ; they 



come to maturity sooner, and the young commence breeding sooner. 



t life in ome form i .1 think, more rife than in England, 



