OF

THE ROYAL SOCIETY

OF

EDINBURGH.

VOL. XXXIII.

NOVEMBER 1912 TO JULY 1913.

EDINBURGH:

PRINTED BY NEILL AND COMPANY, LIMITED.
MDCCCCXIV,

J

222142

CONTENTS.

1. On a Method of determining Vapour Densities at High Temperatures, and on a

new form of Quartz Manometer. By G. E. Gibson, B.Sc., Ph.D. (Carnegie

Fellow, 1912). Communicated by Professor John Gibson. Issued separately

January 17, 1913,

2. The Hydroid Zoophytes collected by the British Antarctic Expedition of Sir

Ernest Shackleton, 1908. By James Ritchie, M.A., D.Sc., Royal Scottish

Museum, Edinburgh. Communicated by W. Eagle Clarke, F.L.S. Issued

separately February 13, 1913,

3. The Absorption of Light by Inorganic Salts. No. VII.: Aqueous Solutions of

Iron Salts. By John S. Anderson, M.A., B.Sc., 1851 Exhibition Research

Scholar (Glasgow.) Communicated by Dr R. A. Houstoun. Issued separately

February 13, 1913, .

4. The Absorption of Light by Inorganic Salts. No. VIII.: Alcoholic Solutions of

Copper, Cobalt, and Nickel Salts in the Ultra-Violet. By Alex. R. Brown,

M.A., B.Sc., Carnegie Research Scholar in the University of Glasgow. Com-

municated by Dr R. A. Houstoun. Issued separately February 13, 1913,

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5. The Theory of Axisymmetric Determinants from 1857 to 1880. By Thomas

Muir, LL.D. Issued separately March 15, 1913,

Com-

6. The Precipitation of Salts by the Corresponding Acids. By Irvine Masson,

M.Sc. (1851 Exhibition Scholar of the University of Melbourne).

municated by Professor James Walker, F.R.S. Issued separately March

24, 1913, .

7. Preliminary Observations on Magnetic Induction in Ferric Oxide at Various

Temperatures and in Different States, and on the Possible Chemical Changes

indicated by the Observations. By G. E. Allan, D.Sc., Lecturer on Electricity,

Pure and Applied, and Assistant to the Professor of Natural Philosophy in

the University of Glasgow; and John Brown, M.A., B.Sc., Houldsworth

Research Scholar in the University of Glasgow. Communicated by Professor

A. Gray, F.R.S. Issued separately March 24, 1913,

8. Studies on Periodicity in Plant Growth. Part I.: A Four-Day Periodicity and

Root Periodicity. By R. A. Robertson, M.A., F.L.S., and Rosalind Crosse,

B.Sc., Carnegie Research Scholar, Botanical Department, The University,

St Andrews. (With Three Plates.) Issued separately March 26, 1913,

9. The Error caused by "Lag" in a Recording Instrument: An Experimental

Study. By J. R. Milne, D.Sc., and H. Levy, M.A., B.Sc., Carnegie Scholar.

Issued separately April 11, 1913,

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