MANI^AL OF FISH-CULTURE. 101 



are packed tightly arouucl the crate, a few being thrown in and pounded 

 down securely before more are added. This must be well done, as the 

 shavings are the only means of preventing a change in the position of 

 the crate. The top of the crate is then covered with closely packed 

 shavings and the cover of the case screwed on. By means of rope or 

 iron handles the case may now be moved about with ease, and is ready 

 for shipment. 



REFRIGERATOE BOX FOE, SHIPMENTS ABROAD. 



A double box is used for this purpose. The inside one is 2i inches 

 larger on all sides than the crate of trays, and the outside one large 

 enough to make a 5-inch space on all sides when the smaller box 

 is placed within it. The trays of eggs are prepared as in ordinary 

 shipments, and when crated are placed in the smaller box upon a frame 

 which is constructed from a ^-inch strip, 2^ inches wide, tacked at right 

 angles to the inside and bottom of this box. In the chamber thus 

 formed between the crate and the box is packed finely chopped ice, an 

 exit for the water resulting from its melting being provided by a half 

 dozen openings in the bottom of the box. This box is now packed 

 according to the same plan as that followed with the shipments for a 

 short distance. Where there is an opportunity, it is well to have the 

 case unpacked en route and new ice added. 



Eggs have been sent in this manner to England, Mexico, New Zea- 

 land. Japan, and South America. 



DISEASES. 



lirook-trout fry are subject to diseases and epidemics, and extreme 

 measures are often necessary to eradicate these evils. Many experi- 

 ments have been made to discover some method of treatment that will 

 prevent the introduction of disease. At Northville the troughs are 

 Unshed every day for five minutes with an extra supply of water, and 

 twice a week they are thoroughly cleansed with a stiff brusb or sponge. 

 The fry are then treated with a weak solution of salt, which is allowed 

 to remain until the fish show signs of discomfort, when the troughs are 

 flushed for a few minutes and the water reduced to its regular flow. 

 As the fish increase in size they may be thinned out in the trough and 

 also at the first indication of disease. 



