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RECENT PAPERS IN THE ^PHILOSOPHICAL TRANSACTIONS,’ 
1911-1912. 
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A 486. Some Phenomena of Sunspots and of Terrestrial Magnetism at Kew Observatory. By 
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A 487. Physico-Chemical Determinations at High Pressures by Optical Methods. (Eesearch executed 
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A 488. A Hew Treatment of Optical Aberrations. By E. A. Sampson, F.E.S. Pp. 37. Price 2s. 
A 489. On the Variation with Temperature of the Eate 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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B 291. On the Distribution of the Nerves of the Dental Pulp. By J. Howard Mummery, M.E.C.S., 
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B 294. A Metrical Analysis of Chromosome Complexes, showing Correlation of Evolutionary 
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