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A 488. A New Treatment of Optical Aberrations. By K. A. Sampson, F.E.S. Pp. 37. Price 2s. 
A 489. On the Variation with Temperature of the Bate of a Chemical Change. By A. Vernon 
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A 490, On the Emission Velocities of Photo-Electrons. By A, Ll. Hughes, M.Sc., B.A., Eesearch 
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A 491. On the Apparent Change in Weight during Chemical Eeaction. By J. J. Manley, Hon, M.A. 
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A 492. Optical Eotatory Dispersion.—Part I. The Natural and Magnetic Eotatory Dispersion in Quartz 
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A 493. The Effect produced by an Obstacle on a Train of Electric Waves. By H. M. Macdonald, 
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A 494. On the Foundations of the Theory of Algebraic Functions of One Variable. By J. C. Fields, 
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A 495. On the Scattering and Absorption of Light in Gaseous Media, with Applications to the Intensity 
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B 296. A Petrified Williamsonia from Scotland. By A. C. Seward, F.E.S., Cambridge. Pp. 26; 
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B 297. The Effects of Stimulation and Extirpation of the Labyrinth of the Ear, and their Eelation to 
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B 298. Notes on the Life-History of Trypanosoma gambiense, with a brief reference to the Cycles of 
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