AETIFICIAL, PROPAGATION OF PACIFIC SALMONS, 



27 



both, the 2-inch space between the walls being filled with nonconducting mate- 

 rial, preferably tightly packed shavings. Between the inner wall and the 

 stack of trays is a 2f-inch space for ice, separated from the trays by perfo- 

 rated zinc. Between the latter and the trays, in a three-fourths-inch space, 

 are the vertical supports of the zinc, viz, double corner supports, one being one- 

 half by I5 inches, the other being one-half by 1 incli; two intermediate sup- 

 ports of one-half by 1 inch material, which are provided on either side of the 

 case and one at each eud ; and crass braces of one-half by 1 inch material, 

 which extend from the uprights to the inner walls of the case. 



The ice hopper, 3 inches in depth, and having the same outside dimensions 

 as the trays, rests upon the latter and tills the space between the uppermost 

 tray and the top of the case. It has a perforated zinc bottom, and, to facili- 

 tate handling, cleats of small ropes are attached to it. The top of the case is 

 insulated with a 2-inch thickness of nonconductor covered with sheet zinc, this 

 insulation titting closely into the chest when closed, and thus covering not 

 only the ice hopper, but the ice spaces around the sides as well. In the bot- 

 tom grooves lead to a three-fourths-inch drain hole, which is provided witli a 



^gL M/zT^e /rasp 

 ^^^ /-/ra /aas/t/ir 



Fig. 11. — Argentine shipping case. 



Section. 



cork. Two cleats seven-eigliths by 3 inches are attached lengthwise to the 

 bottom on the outside. 



Tlie trays are one-half inch deep, 27 inches long, and 9 inches wide, inside 

 measurement, the frames being of one-half by one-fourth inch material. The 

 bottom of each tray is covered with wire cloth, No. 25 gauge, about 12 meshes 

 to the inch, stretched tightly to prevent sagging and consequent uneven dis- 

 tribution of the drip water. A narrow binding of cloth is tacked around the 

 bottom of each tray to prevent the wire edge from catching on the mosquito- 

 net covering of the tray beneath. On the inside ends of the trays are fastened 

 short lifting cleats, and wedges hold the trays securely in place. The bottom 

 tray rests on three one-half-inch cleats extending lengthwise of the case, one 

 at either side and the other in the middle. It is important to have the trays of 

 uniform size that they may be interchangeable. 



The trays and interior of the case are coated with asphaltum. To facilitate 

 opening from either side, four hasps are used, two on each side of the case. 

 Two rope handles side by side are placed ou each end of the case, with a 

 cleat of three-fourths-inch material just above the holes for each handle. 



Eggs selected for shipping should barely show the eyespots without the aid 

 of a glass. In packing, a layer of damp moss is spread one-fourth of an 

 inch deep as evenly as possible over the tray bottom, and upon this is placed 

 a covering of mosquito net or bobbinet. The eggs are laid upon the netting 

 one or two layers deep, spread to within one-half incli of the tray frame, and 

 covered with another piece of netting to keep them separate from the moss, 

 which is sprinkled in a light layer over it, filling the tray. The netting is cut 

 large enough to extend over the outer edges of the tray, so that the eggs may not 

 be disturbed when a tray is lifted for examination. 



