426 ANNUAL RECORD OF SCIENCE AND INDUSTRY. 



Special attention is invited by the society to the Califor- 

 nia fish, and the hope is expressed that it may be ultimately 

 introduced into the tributaries of the Mediterranean, and es- 

 pecially into the Rhone. 10 B,May 30, 1875, 60. 



CHANGE OF WATEE IN AQUARIA. 



A writer upon marine aquaria remarks that the experience 

 of Mr. Bawins, who has possessed a marine aquarium for 

 ten years, has been that he has not renewed the sea-water 

 contained in it during that period. All that he has done is 

 to add fresh water as the salt water evaporates, the same 

 degree of saltness being invariably maintained. Various 

 species of small sea-weeds and several mollusks thrive with- 

 out further care ; but some species of Actinia raised in the 

 same medium were starved to death in the absence of the 

 owner, who had made a practice of feeding them with worms 

 and even raw meat. 12^4, June 10, 116. 



FRENCH PRIZES FOR AMERICAN FISH. 



North America possesses an enviable superiority over 

 most parts of the world in the number and variety of fresh- 

 water fishes capable of being multiplied artificially for the 

 service of mankind, having species corresponding to nearly 

 all those known elsewhere, and several forms entirely pe- 

 culiar to its own waters. Thus while its wall-eyed pike, or 

 pike-perch, is equivalent to the much-esteemed sanclre, the 

 yellow perch to a similar species in Europe, the striped bass, 

 or the rock-fish, to the European bass, it has in the black 

 bass and the large variety of smelt, the trout, whitefish, 

 and the California salmon, forms whose introduction into 

 Europe is very desirable, to say nothing of the shad and 

 ale wife. 



Recognizing: this fact, the authorities of the Paris Societe 

 d'Acclimatation have offered prizes of five hundred francs, 

 respectively, for the introduction into France of our common 

 brook-trout, of the Otsego bass, the California salmon, and 

 the black bass, on the condition that the imported fish sur- 

 vived for more than a year. If young fish bred from these 

 parents can be exhibited, then the amount of the prize in 

 each case is to be doubled. The prizes in regard to the trout 

 and black bass were open till the 1st of December, 1875 ; those 



