580 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



the salmon -breeding establishment at Bucksport, as illustrated in the 

 accompanying diagram and its explanation. (Plate XVII, Figs. 4 & 5.) 

 The drawing represents the box in the position it assumes floating in 

 the stream ; a i^ortion of the nearest end removed to show the bottom. 

 The left face is presented to the current, and the water enters in the 

 direction represented by the arrow. Circulation is produced by the 

 movement of the current up the inclined bottom, \v^hich carries the eggs 

 with it, to fall back again in the recoil from the back of the box. When 

 left entirely to itself, it floats in such a position that the bottom is at an 

 angle with the surface of the stream, and this angle is to be in an oppo- 

 site direction to the current from that of Seth Green's box, and can be 

 increased to whatever extent desired by weighting the front of the box. 



2. — TRAY- APPARATUS FOR HATCHING. 



RoltorCs tray -hatching apparatus. — United. States Patent-OfQce. — Marcel- 

 lus G. Holton, of Eochester, N. Y., assignor of one-half his right to 

 Seth Green, of same place. — Improvement in fish -spawn hatchers. — 

 (Specification forming part of letters-patent IsTo, 130834, dated March 

 18, 1873.) 



suitable auchoriug-cord, c. They are connected together a few feet from the bars, and 

 continued in one cord to the anchor I: The chambers may be cut down, as shown, or 

 they may be left full, as indicated by the dotted lines d. The flDats F may be very much 

 lengthened, if desired, and a series of cases attached to them, or there may be a long 

 case made and pi-ovided with suitable divisions and anchored across the stream, from 

 each end, but I prefer to have the cases made separate, and in size and proportion about 

 as first described. They should be arranged mora or less obliquely upon the tioats F, 

 according to the rapidity with which the current runs in which they are to be an- 

 chored. The obliquity shown in the drawing I find well adapted to a current running 

 about two miles per hour, for shad, which affords a perfect circulation, just sufficient 

 to keep the shad-spawn perfectly buoyed in the water, and all exposed to a gentle 

 agitation. In a faster stream or current, the case should be arranged flatter upon the 

 floats, and vice versa. 



The si)awu to be hatched in this apparatus is prepared in the usual manner for arti- 

 ficial hatching. The cases should bo carefully watched. They should be anchored in 

 a current for shad, but may be anchored in still water for certain other varieties of 

 fish, and for frogs. As soon as the spawn is hatched, the plate C is raised and the young 

 shad pass out through the screen N. The case must only be opened after dark, for 

 shad, as the smaller fish which would take the young shad oulj^ feed during the day. 

 This gives the young shad an opportunity to take care of themselves as nature dictates. 



The ends or sides, either or both, may be made of wire or cloth screens, with a bot- 

 tom of the same, or it may be made close, but I prefer the construction principally 

 shown and described. It will be seen that by this jjlan the spawn is all exposed to the 

 circulation necessary, and is entirely relieved from all sediment or other obstructions 

 or tendencies to prevent a perfect hatching. 



What I claim as my invention, and desire to secure by letters-patent, is — 



The employment or use of the fish-propagator or spawn-hatcher, constructed and 

 arranged substantially in the manner and for the purposes herein shown and described.^ 



SETH GREEN, 



Witnesi-es : 



Wm. S. LOUGHBOKOrGH. 



Fked. a. Hatch. 



t 



