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Vol. I, No. 24. _____ December 1 1, 1880. 



t CONTENTS. 



Kepon r.f ilic I'nitcd States Commissione r of Education (Edit.); The Epson Mineral Witerof Missouri, by Prof. Chas. E. Wait; The 

 Anthropological Society oi Washington ; I he Man of the Caves, hy Prof. W. Boyd Dawkins ; Natural Selection ; l'ropagaion of 

 Sound by Light in 1811 , The National Academy ol Sciences; On the Measure nent of Radiant Energy, by l'rof. S. I'. Langley ; The 

 Intimate Structure of Certain Mineral Veins, by IVof h mjamin Si Hi man ; rhe Turquiise of New Mexico, by Prof. Benjamin Silli- 

 man; A. New General Method of Analysis, bv l'rof. Wolcott Gibbs; Note upon the Relations of the O neon ta and Montrose Sandstones 

 ol Vanuxem, and their Relation to ihe Sandstones of the Ca (ski '1 Mountains, i>v l'rof. James Hall; An Improved Metho I ol Operat- 

 ing ili" Sprengel Air-Pump, by Prof. Ogden N. Rood; Report ol the Comm ssi mei ol Educa'ion lor 1878 (Extrac s) ; Educational 

 Bene! I ; Th( Devonian Insects of New Brunswick, by Mr. S. H. Scuddei ; Minn espy; Motion of the Spots on the 



Surfai r, by Mr. E. E. Barnard; The November Leonids, by Prof. Edwin F. Sawyer; Swift's Comet (Letter to the 



Editor), by l'rof. William W.Payne; Astronomical Memoranda Letters to the Editor; Books Received; Notes, Chemical, 

 lomical, Mineralogical, etc., etc., etc. 



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