IV 
CONTENTS. 
NO. 
VI. The Precipitation of Salts by the Corresponding Acids. By 
Irvine Masson, M.Sc. (1851 Exhibition Scholar of the 
University of Melbourne). ( Communicated by Professor 
James Walker, F.R.S.), . . . . ■ f 
(. Issued separately March 24, 1913.) 
VII. 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. ( Com- 
municated by Professor A. Gray, F.R.S.), . 
( Issued separately March 24, 1913.) 
VIII. Studies on Periodicity in Plant Growth. Part I. : A Four- 
Day Periodicity and Root Periodicity. By R. A. Robert- 
son, 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.) 
IX. 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.) 
X. A New Method of Starting Mercury Vapour Apparatus. By 
John S. Anderson, M.A., B.Sc., 1851 Exhibition Science 
Scholar (Glasgow) ; and George B. Burnside, Mechanical 
Assistant to the Professor of Natural Philosophy in the 
University of Glasgow. ( Communicated by Prof. A. Gray, 
F.R.S.). (With One Plate.), . . . ‘ > 
(. Issued separately April 11, 1913.) 
XI. On the Application of Manley’s Differential Densimeter to the 
Study of Sea- waters on board Ship. By Norman Phillips 
Campbell, B.A. Oxon. ( Communicated by Sir John 
Murray, K.C.B.), ...... 
( Issued separately , 1913.) 
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