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Fifth and Sixth Catalogues of the Comparative Brightness of the Stars—in Continuation of 
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On the Accurate Measurement of Ionic Yelocities, with Applications to Various Ions. By 
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On Mathematical Concepts of the Material World. By A. N. Whitehead, Sc.D., F.R.S., 
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The Combination of Hydrogen and Oxygen in Contact with Hot Surfaces. By William 
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On the Periodicities of Sunspots. By Arthur Schuster, F.R.S. Pp. 32. Price Is. 6 d . 
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B. 243. Contributions to the Physiology of Mammalian Reproduction.—Part I. The CEstrous Cycle in 
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B. 244. The Morphology of the Ungulate Placenta, particularly the Development of that Organ in the 
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