CO:STEmS— (continued). 



I'AGE 



II. Condensation of Vapour of Mercury on Selenium in the Sprengel Yacuum. 



By E. J. Moss, F.C.S., Chemical Laboratory, Eoyal Dublin Society . . 22 



IV. On Simultaneous Variations of the Barometer in India. By J. A. BeoujSt, 



F.E.S. (Plate I.) 24 



A". Supplementary Note on Simultaneous Barometric Variations. By J. A. 



Begun, F.E.S. (Plate!.) 39 



VI. On Clairautian Functions and Equations. By Capt. Allan Cunning-ham, 



E.E., Hon. Fellow of King's Coll. Lond. (Eoorkee, India) 43 



3Iai/ 18, 1876. 



I. Absorption-Spectra of Iodine." By Sir John Coneot, Bart., M. A. ... 46 



II. On the Polarization of Light by Crystals of Iodine. By Sir John Coneot, 



Bart., M.A \ 51 



III. PicroroceUin. By John Stenhouse, LL.D., F.E.S., and Chaeles Edwaed 



GrEOVES 60 



IV. On the Organization of the Fossil Plants of the Coal-measures. — Part Vlil. 



Ferns (continued) and G-ymnospermous Stems and Seeds. By Prof. W. 

 C. Williamson, F.E.S., Professor of Natural History, Owens College, 

 i\Ianchester 68 



V. On Stratified Discharges. — II. Obseryations with a Eevolving Mirror. By 



William Spottiswoode, M.A., Treas. E.S 73 



VI. The Calculus of Chemical Operations. — Part II. On the Analysis of Chemical 

 Events. By Sir B. C. Beodie, Bart., F.E.S., late Professor of Chemistry 

 in the University of Oxford 83 



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