PHILOSOPHICAL SOCIETY OF WASHINGTON. 169 



Page. 

 H. Kekd, (of Cincinnati.) 



On the Physiology of Civilization 20 



C. V. KiLET. 



On the Pupation of the Nymphalidae 41 



On the Issuance of Silk -worm Moths from their Cocoons . 44 



C. A. SCHOTT. 



On the Secular Change in the Magnetic Declination . . 45 



A. N. Skinnek. 



A Note on the Pfecession of Stars in Right Ascension . 21 



W. B. Taylor. 



Remarks on " the Michelson Phenomena " . . . . 120 



Remarks Commemorative of J. H. Lane .... 124 



Remarks on " the Michelson Phenomena " .... 125 



Remarks on the Development of the Moral Sentiments . 138 



D. P. Todd. 



On Solar Parallax from the Velocity of Light ... 74 



On a Mechanical Attachment for Equatorial Mountings . 142 



L. P. Ward. 



On the Origin of the Chemical Elements .... 33 



Hon. a. J. Warner. 



Remarks on the Relations of Gold and Silver to Prices . 112 



C. A. White. 



On the Fresh Water Shell Heaps of the Interior Rivers of 



North America ........ 82 



On the Permian Formation in North America . . . 104 



Proitessor a. Winchell, (of Syracu.ee, N. Y.) 



On the Progressive Dispersion of Mankind over the Surface 



of tlie Earth 32 



J. .J. Woodward. 



On the Apertometer of Professor E. Abbe, of Jena, Germany 18 



On a Standard for Micrometry 22 



On the Oil-Immersion Objectives of Zeiss, and Oblique Illu- 

 mination ......... 25 



A new Apertometer for Microscopic Objectives ... 37 



On Apparatus for the Examination of the Eye ... 53 



