Now radium itself is a constituent of uranium minerals, and two series of experiments by R.J. Strutt and B.B. Boltwood have shown that the content of radium, as measured by the radio-activity of the emanation, is directly proportional to the content of uranium. (Strutt, "Proc. Soc." A, February 1905; Boltwood, "Phil. Mag." April, 1905.) In Boltwood's investigation, some twenty minerals, with amounts of uranium varying from that in a specimen of uraninite with 74.65 per cent., to that in a monazite with 0.30 per cent., gave a ratio of uranium to radium, constant within about one part in ten.英文原著 · 《Darwin and Modern Science》
Military and Civil........Mahan's Field Fortification. Engineering, and Mahan's Outlines of Sciences of War. Permanent Fortification. Mahan's Fortification and Stereotomy. Mahan's Advanced Guard and Outpost, etc. *Moseley's Mechanics of Engineering. Mineralogy and Geology....Dana's Mineralogy. Hitchcock's Geology.英文原著 · 《Henry Ossian Flipper》
It remained, however, throughout antiquity as the most important work on its subject, and it entitles Theophrastus to be called the "father of botany." Theophrastus deals also with the mineral kingdom after much the same fashion, and here again his work is the most notable that was produced in antiquity.英文原著 · 《A History of Science-1》
It was in a home in Newburyport, Massachusetts, and there was no silver there, all away off--well, I don't know where, and he did not, but somewhere else, and he was a professor of mineralogy.英文原著 · 《Acres of Diamonds》
Nitric Acid--Exists in combination with the bases, potash, soda, lime, magnesia, in both the mineral and vegetable kingdoms, and is never found insoluble. It has the same constituents as common air, but in different proportions. The strongest nitric acid contains in every pound, two and a quarter ounces of water. Pure nitric acid is colorless, with a specific gravity of 1.5, and boiling at 248 deg.. It is a most powerful oxidizing agent, and is decomposed with more or less rapidity, by almost all the metals, to which it yields a portion of its oxygen.英文原著 · 《American Hand Book of the Daguerreotype》