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A 575. On Intensity Relations in the Spectrum of Helium. By T. R. Merton, D.Sc., Lecturer in 
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A 576. The Scattering of Plane Electric Waves by Spheres. By T. J. I’A. Bromwich, Sc.D., F.R.S. 
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A 577. On the Fundamental Formulations of Electrodynamics. By G. H. Livens, University of 
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A 578. The Influence of Molecular Constitution and Temperature on Magnetic Susceptibility. 
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A 579. A Determination of the Deflection of Light by the Sun’s Gravitational Field, from Observations 
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A 580. A Critical Study of Spectral Series. Part V.—The Spectra of the Monatomic Gases. By 
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A 581. Title, Contents, Index, &c., Vol. 220. Pp. 10. Price 6 d. 
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A 582. Some Measurements of Atmospheric Turbulence. By Lewis F. Richardson. Pp. 30. 
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Series B. — Biological. 
B 365. The Epithelial Sheath of Hertwig in the Teeth of Man, with Notes on the Follicle and 
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B 366. On Nerve-End Cells in the Dental Pulp. By J. Howard Mummery, D.Sc. (Hon.), Penn., M.R.C.S. 
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B 367. The Transition from Rostro-Carinate Flint Instruments to the Tongue-Shaped Implements of 
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B 368. The Development of the Sea-Anemones Metridium Dianthus (Ellis) and Adamsia Palliata 
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B 369. The Morphology and Evolution of the Ambulacrum in the Echinoidea Holectypoida. By 
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B 370. On the Structure of Lysorophus, as Exposed by Serial Sections. By W. J. Sollas, Sc.D., 
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B 371. Title, Contents, Index, &c., Vol. 209. Pp. 10. Price 6 d. 
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B 372. The Respiratory Exchange of Man During and After Muscular Exercise. By J. M. H. Campbell, 
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B 373. The Microscopical Features of Mechanical Strains in Timber and the Bearing of these on the 
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