Nature . ichten. Of these, hefinds, on comparison, that the following agree most closelywith observational results : — t Ophiuchi n = 76 12A=I7 457 = 66 4 ^=0-5338 P = 22382J. T=i8i479 a = I 307 y Centauri fl = 3 21A = 285 27 = 8l 47f = 0-2958 P = 2ii-93^.T= 1851-63 n=l-924 The value of the hypothetical parallax for t Ophiuchiis oo35, and for 7 Centauri o-o54. In the elements ofthe latter, the epoch and the longitude of periastron aresomewhat uncertain, and for this star the motion isretrograde. 3o6 NA TURE |January 25, 1906 ECONOMIC GEOLOGY INSTATES. THE UNITED HTHE energy shown by all branch
Nature . ichten. Of these, hefinds, on comparison, that the following agree most closelywith observational results : — t Ophiuchi n = 76 12A=I7 457 = 66 4 ^=0-5338 P = 22382J. T=i8i479 a = I 307 y Centauri fl = 3 21A = 285 27 = 8l 47f = 0-2958 P = 2ii-93^.T= 1851-63 n=l-924 The value of the hypothetical parallax for t Ophiuchiis oo35, and for 7 Centauri o-o54. In the elements ofthe latter, the epoch and the longitude of periastron aresomewhat uncertain, and for this star the motion isretrograde. 3o6 NA TURE |January 25, 1906 ECONOMIC GEOLOGY INSTATES. THE UNITED HTHE energy shown by all branches of the United StatesGeological Survey increases year by year, and it isimpossible to overestimate the importance of the resultsachieved during the twenty-five years of its existence. Theprompt return made for the pecuniary support accorded tothe survey is best shown by the numerous publications,appearing each year, which are devoted to the developmentof the mineral resources and to the advancement of. important engineering projects. The miner is thus taughtthe practical value of geological work, and mining develop-ment is placed upon a scientific basis. A large number ofbulletins have recently been published which, though de-scribing researches of an essentially scientific nature, dealwith the economic resources of specified districts. Halfa dozen of these bulletins, well illustrating the educationalvalue of the surveys work to those engaged in the miningindustry, have been selected for brief notice. Of these themost important is No. 260, Contributions to EconomicGeology, 1004, in which Mr. S. and Mr. C. W. Hayes, thegeologists in charge of the sectionsdealing with ores and non-metallicminerals respectively, bring before thepublic with all possible speed theeconomic results arrived at by thesurvey. The bulletin covers 620 pages,and contains sixty-three contributions aAtff^H from thirty-seven members of thesurvey who have been engaged ,.-, throughout the year in ec
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