40 



PACKING THK TROUT OVA. 



The trays in which ova are packed merely consist of a light 

 wooden frame, 10 in. square, 2 in. deep, bottomed with old per- 

 forated zinc, the older the better. At Howietoun the zinc screens 

 are renewed periodically, and the old zinc removed and carefully 

 put by for bottoming travelling trays, by which a double economy 

 is effected, as, the screens being renewed before they are worn out, 

 all risk of loss through a broken screen is avoided, and the per- 

 forated zinc is rendered by a year's immersion the most suitable 

 and absolutely safe material for bottoming travelling trays (Fig. 12). 



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FIG. 12 scale J. 



FIG. 13 scale J. 



The ordinary packing- boxes consist of an inner box three-eighths 

 of an inch larger than the frames, so that they can be easily 

 lowered or raised by means of the flannel slip, without having 

 sufficient room to shake about. The outer box is 4 inches 

 deeper than the inner, and 3 inches wider, so that a sufficient 

 quantity of sawdust can be packed between the two boxes, which 

 serves not only as a protection against any frost likely to be en- 

 countered in this country, but also to act as a cushion, and mini- 

 mise the effects of rough usage incidental to travel. And here I 

 may say that the heavier the box the more care railways and steam- 

 ships bestow on it. Rope handles are fitted to the outside box to 

 facilitate handling, and the name of the Fishery painted on one 

 side, with the number of the box on the other (Figs. 14, 15). 



The foreign egg-boxes are constructed with a view to the 

 supply of ice during the voyage, and an air-space surrounds the 

 trays to secure an equal temperature to each. The boxes are 2 feet 



