434 ANNUAL RECORD OF SCIENCE AND INDUSTRY. 



fish-raisers, having been known to destroy many thousands 

 of pounds of fish in a single season) may be the result of 

 some unexplained agency or influence of cooked meats such 

 as are usually fed to trout, and allied to scurvy. If, there- 

 fore, the change to a vegetable diet will prevent its occur- 

 rence, it will be a very important fact. 



Dr. Goldsmith advises corn-bread, as being the least ex- 

 pensive, but finds that any other bread will answer. 



ELECTRICAL FISH-BAIT. 



Among the novelties in the late Paris Maritime Exhibition 

 is an electrical fish-bait. It consists of a wire of platinum 

 placed in a bottle of dark-colored glass, and made luminous 

 by electricity from a bichromate battery. When thrown 

 into the water the light emanating therefrom is said to at- 

 tract immense numbers of fishes. 



UNITED STATES SALMON-HATCHING ESTABLISHMENT. 



The operations during the season of 1875 of the United 

 States salmon-hatching establishment on the M'Cloud River, 

 a tributary of the Upper Sacramento, under the direction 

 of Mr. Livingston Stone, have been conducted with great 

 vigor and with wonderful success, upward of 9,000,000 eggs 

 having been obtained, of which 6,210,000 were sent East in 

 good condition. The remainder have been kept in the 

 hatching-house at the camp, to be developed and placed in 

 the Sacramento River. 



The eggs were packed in 156 packages, each two feet 

 square by six inches deep ; 80,000 eggs were placed in each 

 box, in layers properly separated by damp moss. They 

 were then packed in crates in pairs, surrounded by stuffing 

 of some kind to prevent jarring. Several different sub- 

 stances were used for this purpose, as moss, hay, and ferns, 

 in order to determine which material is best ada23ted to the 

 purpose. 



The total weight of the consignments amounted to over 

 20,000 pounds. The bulk of the' eggs alone, without the 

 packing, was 80 bushels; 150 bushels of moss were required 

 for packing. 



So far as heard from, the eggs sent East during the pres- 

 ent season have all arrived in good condition, with very 



