CONTENTS {continued). 



April 29, 1880. 



PAGE 



I. Note on the Spectrum of Carbon. By J. Norman Lockyee, F.E.S. . 335 



II. On the Diurnal "Variation in the Amount of Carbon Dioxide in the Air. 

 By George Frederick Armstrong, M.A., F.G.S., C.E., Professor of 

 Engineering in the Yorkshire College, Leeds 343 



III. Measurement of the Actinism of the Sun's Rays and of Daylight. By 



Dr. E. Angus Smith, F.E.S 355 



IV. On some Elementary Principles in Animal Mechanics. No. X (concluding 



the series). Further illustrations of the "Law of Fatigue." By the 

 Eev. Samuel Haughton, M.D. (Dubl.), D.C.L. (Oxqn.), F.E.S., 

 Fellow of Trinity College, Dublin 359 



V. On the Absence of Potassium in Protagon prepared by Dr. Gramgee. By 



Professor H. E. Eosgoe, LL.D., F.E.S 365 



List of Presents . . ' 365 



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 1880. 



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