CONTENTS OF VOLUME XIII. 



NUMBER LXXIII. 



Art. I. — Contributions to Meteorology, being results derived 

 from an examination of the Observations of the United 

 States Signal Service, and from other sources; by Ei.ias 



II.— On some Points in" Connection with Vegetat"ioiV;"l»y J. 



H. Gilbert, •_><) 



III.— Observations on a property of the Retina, first noticed 



byTait; by Ogdkn X. Rood, ;)2 



IV.— On grains of Metallic Iron in Dolerytes from New 



Hampshire ; by George W. Havves, 33 



V. — On certain Phenomena of Binocular Vision; by Francis 



E.Nipher, _. 35 



VI.— Notes on the Vespertine Strata <>f Virginia and West 



Virginia; by William M. FoNTAnra, . — - 37 



VII.— On the production of Transparent Metallic Film by 



the Electrical Discharge in exhausted tubes; by Arthur 



W.Wright, 49 



Appendix. — Photographs of the Spectra of Venus and a 



Lyras. Note by Prof. Henry Draper, ...3d page of cover. 

 SCIENTIFIC INTELLIGENCE. 

 Chemistry and Phytics.— So-calk-d Crystallized Boron, Hampe, 55.— Constitution 



Dr. Sabixe. BO.— Ch. 



._,■■■:; i, 





Amei 















nliqlj. 

















and extinct, J. A. 











Glacial Phenomena 



of N. rri 















A me 





80.— Outline of the 











and Prairie regions : 



Great . 































. 







Flowirs, 82—Geogr: 





















Explorations and Su 



rveys. w 



est of the Om 





Iredth Men 



,-Tl - u 



rclunirr 



, «.•". i. 



.U-elm 



ationinthe 



