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A 570. The Magnetic Ee-Survey of the British Isles for the Epoch January 1, 1915. By George W. 
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A 573. Bakerian Lecture, 1918.—Experiments on the Artificial Production of Diamond. By 
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A 574. The Pressure upon the Poles of the Electric Are. By W. G. Duffield, D.Sc., Professor of 
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A 575. On Intensify Relations in the Spectrum of Helium. By T. R. Merton, D.Sc., Lecturer in 
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B 361. On the Structure and Biology of Archotermopsis, togethei; with Descriptions of New Species of 
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B 362. An Investigation into the Periodicity of Measles Epidemics in the Different Districts of London 
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B 364. Recherches Anatomo-Cliniques sur les N^vromes d’Amputations Douloureux. Nouvelles 
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