582 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



The case may be Diade of any desired size; but I prefer them about 

 eighte;^u inches to two feet square, and from two to four feet or more in 

 height, according to the amount of fall afforded to the water from the 

 spring or fountain. 



The cases may be arranged in tiers the whole length of the floor of the 

 hatching house, and the water overflowing from one made to pass into 

 and through the next succeeding one to any desired extent as to num- 

 bers. 



The lower tray is suspended, when it is to be filled, in the position oc- 

 cupied by the upper tray c' . The spawn is deposited evenly over the sur- 

 face of the wire-gauze, and in a suitable quantity. The tray is then 

 lowered by the straps s sufficiently to permit the insertion of another 

 tray, which is treated in a like manner, and so on until the case is filled. 

 The trays and young fish may then be removed in a similar manner — 

 that is, one tray at a time — and the water allowed to flow through dur- 

 ing either process. 



It will be seen that the spawn will remain evenly distributed on 

 account of the longitudinal position of the trays; and, by means of the 

 buoyant tendency of the upward current, there is no damage or loss of 

 spawn by lack of circulation. 



This plan is intended more especially for winter-hatching, or for the 

 spawn of white-fish; but it may also be used for almost any other kind. 



What I claim as my invention is — 



1. The spawn-hatching apparatus A, constructed as described, to pro- 

 duce an equally-distributed upward flow or circuhition of the water, for 

 the purposes set forth. 



2. In combination with the spawn-hatching apparatus A, the over- 

 flow-channels G, arranged to equalize the overflow on all sides, substan- 

 tially as and for the purjioses set forth. 



3. In a spawn-hatching device, the trays c and water-inlet opening d^ 

 in combination with the deflector /i, arranged to ojierate substantially 

 as and for the purposes shown and described. 



4. In couibiuation with the spawm-trays c, the concave or hopper- 

 shaped bottom li, substantially as described, and for the purposes set 



forth. 



M. G. HOLTON. 



Witnesses: 



Wm. S. LoUGnBOROUGH. 



Patrick McIntyre. 



Clarices tray-liatcliing apparatus. — Nelson W. Clark, of Olarkstou, Michi- 

 gan* — Improvement in fish-hatching apparatus. — (Specification form- 

 ing part of letters-])atent No. 148035, dated March 3, 1874; application 

 filed January 7, 1874.) 



