Scientific American Volume 31 Number 14 (October 1874) . cid, lenses madetherefrom will greatly decrease secondary dispersion. Phos-phatic glass might answer the same purpose, but it has theobjection of being too perishable and too soft. THE DECOMPOSITION OF EGGS, according to Mr. William Thomson, is due to three agen-cies: First, a putrid cell capable of being developed withinsome eggs, no matter how effectually their shells are pro-tected by varnished coverings. This is generated in the yolk,in which the minute granules assume a morbid vitality, ab- the Universe; and that which it loses in v
Scientific American Volume 31 Number 14 (October 1874) . cid, lenses madetherefrom will greatly decrease secondary dispersion. Phos-phatic glass might answer the same purpose, but it has theobjection of being too perishable and too soft. THE DECOMPOSITION OF EGGS, according to Mr. William Thomson, is due to three agen-cies: First, a putrid cell capable of being developed withinsome eggs, no matter how effectually their shells are pro-tected by varnished coverings. This is generated in the yolk,in which the minute granules assume a morbid vitality, ab- the Universe; and that which it loses in vibratory energywhen it penetrates a cold body, which it warms, it communi-cates to the atoms of this body and augments the intensity oftheir movements; and that which it gains in energy by con-tact with a warm body, which it cools, it withdraws fromthis body and diminishes the intensity of their vibratorymovements. And this kind of light and heat which comeBfrom material bodies is transmitted across space to other ma-terial bodies.—M. Wurtz. Ditch GREAT SIPHON OF THE SPRING VALLEY MINING COMPANY. Feather river. The ditches are six feet wide at bottom and eight feet wideon top. They are four feet deep and run a constant streamof 2,200 inches of water. Ths mine turned out last year the largest gold bar evermade, bsing valued at $71,, and it has been said thatthey will send a bar worth double this amount to the Cen-tennial Exhibition. A rather peculiar feature in this claim is the fact that dia-monds are found in the washings; most of them, however,by the primitive method of rocking. One diamond, worth$250, was cut in Boston in 1864, and last year several weretested in Amsterdam and Paris, and pronounced diamondsof the first water. Professor Silliman has examined thesesands carefully, and enumerates the mineralogy of the Che-rokee washings as yielding gold, platinum, iridosmine, dia-monds, zircon, topaz, quartz in several varieties, chromite,magnetite, limonite, rutile
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