78 ANNUAL OF SCIENTIFIC DISCOVERY. 



selves, or that we shall ever benefit by the superfluity of gi-een 

 turtle to be found in the bays of the Bonin Islands, where they are 

 so numerous "that they quite hide the color of the shore, and 

 many are from 3 to 4 cwt, each ; " but there is no knowing what 

 science may do for us even with respect to preserving this super- 

 abundant flesh and fat. — London Quarterly Review. 



UTILIZATION OF SEWAGE. 



In a recent report of M. Dumas, of Paris, the following pro- 

 cess is recommended for the useful application of sewage : It is 

 collected in reservoirs, and precipitated by a solution of sulphate 

 of alumina. The cost of the precipitant is stated to be one cen- 

 time to the cubic metre of sewage, or less than half a farthing to 

 a cubic yard. The precipitate is quickly deposited, and con- 

 tains all the phosphoric acid and nine-tenths of the nitrogen and 

 organic matters of the sewage ; it is, therefore, a valuable manure. 

 The weight of dry precipitate obtained is 6 kilogrammes per cubic 

 metre. The supernatant liquor is limpid and odorless, and may 

 be run into a stream without fear of dangerous consequences. 



THE LIME LIGHT FOR DWELLINGS. 



The princij)le of the lime light is the same as that known as the 

 *♦ Drummond " light; oxygen, hydrogen, and lime are concerned 

 in its production. According to the *' London Scotsman," they 

 are used as follows : A jet of hydrogen being lighted, a jet of oxy- 

 gen is turned on to mix with it, and the solid incombustible lime, 

 exposed to the intense heat, emits a very pure and powerful light. 

 As the method of using and lighting the jet is the same as with a 

 common gas-burner, no special knowledge or instruction is neces- 

 sary for its management. With a consumption of the gases of 

 1^ ieet per hour, the light produced is equal to 4 gas-lights, each 

 burning 5 feet per hour ; 3 feet per hour give a light equal to 15 

 gas-lights, each burning 5 feet per hour ; and 6 feet per hour are 

 equal to 300 feet of gas. The two gases are easily produced, and 

 a very small main would be sufficient to convey them through the 

 streets to dwelling-houses, for which this light is singularly well- 

 fitted, as its products of combustion are innoxious and have no 

 tarnishing effects ; it exercises also no changing influence on 

 colors, every tint being as distinctly observable as in sunlight. 

 It is believed that the lime light will, in many cases, supersede 

 the use of gas both in a small wav and on an extended scale. 



PRESERVATION OF WINES. 



According to the new process of Mr. Dumesnil, the cask of 

 wine, uncorked, is placed under an iron bell and the air exhausted ; 

 after" two hours the noise occasioned by the exit of the air ceases. 



