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Volume 217 (1918), with 20 Plates, Price £1 11s. 
A 561. The Solar and Lunar Diurnal Variations of Terrestrial Magnetism. By S. Chapman, M.A., 
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A 562. The Specific Heat of Aqueous Solutions, with Special Reference to Sodium and Potassium 
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A 563. Bakerian Lecture, 1917. —The Configurations of Rotating Compressible Masses. By 
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A 564. On the Propagation of Sound in the Free Atmosphere and the Acoustic Efficiency of Fog-signal 
Machinery: An. Account of Experiments Carried Out at Father Point, Quebec, September, 
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A 565. On Osmotic Pressures Derived from Vapour-pressure Measurements : Aqueous Solutions of Cane 
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A 566. The Ultra-Violet Band of Ammonia, and its Occurrence in the Solar Spectrum. By A. Fowler, 
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A 567. Surface Reflexion of Earthquake Waves. By George W. Walker, A.R.C.Sc., M.A., F.R.S., 
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A 568. Monoclinic Double Selenates of the Iron Group. By A. E. H. Tutton, D.Sc., M.A., F.R.S. 
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B 354. On the Structure and Development of the Tubular Enamel of the Sparidse and Labridse. By 
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B 355. The Cytomorphosis of the Marsupial Enamel-Organ and its Significance in Relation to the 
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B 356. The Development of the Pancreas, the Pancreatic and Hepatic Ducts, in Trichosurus Vulpecula. 
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B 357. The Fossil Human Skull found at Talgai, Queensland. By Stewart Arthur Smith, M.B., 
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B 358. New Bennettitean Cones from the British Cretaceous. By Marie C. Stopes, D.Sc. (Lond.), 
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B 359. Title, Contents, Index, &c., Vol. 208. Pp. 10. Price 6 d. 
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