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I. Researches on Chemical Equivalence. Part I. Sodic and Potassic Sul.

phates. By EDMUND J. MILLS, D.Sc., F.R.S., “ Young" Professor of

Technical Chemistry in Anderson's College, Glasgow, and T. U.

WALTON, B.Sc..

268

II. Researches on Chemical Equivalence. Part II. Hydric Chloride and

Sulphate. By EDMUND J. Milis, D.Sc., F.R.S., and JAMES HOGARTH 270

III. Researches on Lactin. By EDMUND J. Mills, D.Sc., F.R.S., “Young

Professor of Technical Chemistry in Anderson's College, Glasgow, and
JAMES HOGARTH

273

IV. On the Microrheometer. By J. B. HANNAY, F.R.S.E., F.C.S., lately

Assistant Lecturer on Chemistry in Owens College, Manchester . 279

V. Limestone as an Index of Geological Time. By T. MELLARD READE,
C.E., F.G.S., F.R.I.B.A.

281
VI. Preliminary Note on the Substances which produce the Chromospheric
Lines. By J. NORMAN LOCKYER, F.R.S.

283

January 30, 1879.

I. On the Effect of Heat on the Di-iodide of Mercury, HgI,. By G. F.

RODWELL, Science Master, and H. M. ELDER, a Pupil, in Marlborough

College

284

II. A Comparison of the Variations of the Diurnal Range of Magnetic

Declination as recorded at the Observatories of Kew and Trevandrum.

By BALFOUR STEWART, F.R.S., Professor of Natural Philosophy in

Owens College, Manchester, and MORISABRO HIRAOKA

288

III. On the Determination of the Rate of Vibration of Tuning Forks. By

HERBERT MCLEOD, F.C.S., and GEORGE SYDENHAM CLARKE,

Lieut. R.E.

291

IV. On certain means of Measuring and Regulating Electric Currents. By

C. WILLIAM SIEMENS, D.C.L., F.R.S. (Plates 4, 5)

292

List of Presents

. 297

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I. On certain Dimensional Properties of Matter in the Gaseous State. Part I.

Experimental Researches on Thermal Transpiration of Gases through Porous Plates, and on the Laws of Transpiration and Impulsion, including an Experimental Proof that Gas is not a Continuous Plenum. Part II. On an Extension of the Dynamical Theory of Gas which includes the Stresses, Tangential and Normal, caused by a Varying Condition of the Gas, and affords an explanation of the Phenomena of Transpiration and Impulsion. By OSBORNE REYNOLDS, F.R.S., Professor of Engineering at Owens College, Manchester

304

II. Absorption of Gases by Charcoal. Part II. On a new Series of Equivalents or Molecules. By R. Angus SMITH, Ph.D., F.R.S.

322

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February 13, 1879.

I. Note on the Development of the Olfactory Nerve and Olfactory Organ of

Vertebrates. By A. MILNES MARSHALL, M.A., D.Sc., Fellow of St.
John's College, Cambridge

324

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II. On the Development of the Skull and its Nerves in the Green Turtle

(Chelone midas), with Remarks on the Segmentation seen in the Skull of various types. By Professor W. K. PARKER, F.R.S.

329

III. On an Extension of the Phenomena discovered by Dr. Kerr and described

by him under the title of "A New Relation between Electricity and
Light.” By J. E. H. GORDON, B.A., Assistant Sec. of the British Asso-
ciation

346

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For continuation of Contents see 4th page of the Wrapper.

Price Three Shillings.

Reports, &c. (continued).
Rome :-Triplice Omaggio alla Santità di Papa Pio IX, nel suo

giubileo episcopale offerto dalle tre Romane Accademie Ponti.
ficia di Archeologia, Insigne delle Belle Arti, Pontificia de'
Nuovi Lincei. Scienze. 4to. Roma 1877.

The Accademia Pontificia de' Nuovi Lincei.

Arya Bhatta. The Elements of Plane Geometry in 48 propositions,

from the Sanscrit text, edited on the principle of Euclid, by Jasoda Nandan Sircar. 12mo. Calcutta 1878.

The Editor. Brongniart (Ch.) Note sur un nouveau genre d’Orthoptère fossile

de la famille des Phasmiens. 8vo. Paris. Note rectificative sur

quelques Diptères tertiaires. 8vo. Lille 1878. The Author. Fayrer (Sir Joseph) F.R.S. On the Bael Fruit and its Medicinal Properties and Uses. 12mo. London 1878.

The Author. Hooker (Sir J. D.), F.R.S. The Flora of British India. Part 5. 8vo. London 1878.

The India Office. Lubbock (Sir John), F.R.S. Pre-historic Times, as illustrated by

Ancient Remains and the Manners and Customs of Modern

Savages. Fourth edition. 8vo. London 1878. The Author. Matton (L. P.) Quadrature du Cercle, son existence prouvée. 4to. Lyon 1878. Polysection et Polysectrices. 4to. 1878.

The Author. Mourek (V. E.) A Dictionary of the English and Bohemian Languages. 12mo. Prague 1879.

The Author. Roscoe (H. E.), F.R.S., and C. Schorlemmer, F.R.S. A Treatise on Chemistry. Vol. II. Metals. Part 1. 8vo. London 1878.

The Authors.

February 6, 1879.

W. SPOTTISWOODE, M.A., D.C.L., President, in the Chair.

The Presents received were laid on the table, and thanks ordered for them.

The following Papers were read :

VOL. XXVIII.

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