February 20, 1879.

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I. On Electrical Insulation in High Vacua. By WILLIAM CROOKES, F.R.S. 347

II. On the Reversal of the Lines of Metallic Vapours. No. IV. By G. D.

LIVEING, M.A., Professor of Chemistry, and J. DEWAR, M.A., F.R.S.,

Jacksonian Professor, University of Cambridge

352

February 27, 1879.

I. Studies in Acoustics. I. On the Synthetic Examination of Vowel Sounds.

By WILLIAM HENRY PREECE and AUGUSTUS STROH. Plates 6, 7. . 358

II. On the Reversal of the Lines of Metallic Vapours. No. V. By G. D.

LIVEING, M.A., Professor of Chemistry, and J. DEWAR, M.A., F.R.S.,

Jacksonian Professor, University of Cambridge

. 367

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March 6, 1879.

No. 194.

I. Observations on the Physiology of the Nervous System of the Crayfish (Astacus Fluviatilis). By JAMES WARD, M.A., Fellow of Trinity College, Cambridge

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II. Preliminary Report upon the Comatulæ of the "Challenger" Expedition.
By P. HERBERT CARPENTER, M.A., Assistant Master at Eton College 383
III. On the Characters of the Pelvis in the Mammalia, and the Conclusions
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I. The Influence of Electricity on Colliding Water Drops. By Lord RAYLEIGH, F.R.S.

406

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Giessen-Grossherzoglich Hessische Ludewigs-Universität. Ueber die Zerlegbarkeit einer ebenen Linie dritter Ordnung in drei gerade Linien, von A. Thaer. 4to. 1878.-Ueber die Traumatischen Rupturen des Darmkanals, von M. Sonnenberger. 8vo. 1878.-Untersuchung der Kegelschnittnetze, deren Jacobi'sche Form oder Hermite'sche Form identisch verschwindet, von J. Hahn. 4to. 1878. Zwei Gelegenheitschriften. 4to. 1878. Zwei Vorlesungsverzeichnisse. 1878-9. 8vo. Zuwachs-Verzeichniss. 4to. 1877. The University. Göttingen:-Königliche Gesellschaft der Wissenschaften. Abhandlungen, vom Jahre 1878. Band XXIII. 4to. 1878. Nachrichten aus dem Jahre 1878. 8vo. The Society. Hamburg :-Naturwissenschaftlicher Verein, von Hamburg-Altona. Verhandlungen im Jahre 1877. Neue Folge II. 8vo. 1878. The Society.

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1877.

Observations, &c.

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