IV. 
CONTENTS. 
PAGE 
NO. 
XXXIII. On the Influence of Temperature upon the Magnetic 
Properties of a Graded Series of Carbon Steels. By 
Margaret B. Moir, M.A., B.Sc., Carnegie Research 
Scholar in the University of Glasgow. ( Communicated 
by Professor A. Gray, F.R.S.), .... 505 
{Issued separately July 7, 1911.) 
XXXI Y. Laboratory Note : A Simple Method of finding the 
Radius of Gyration of a Body. By W. G. Robson, 
A. R.C.S. ( Communicated by Professor W. Peddie), . 517 
{Issued separately July 7, 1911.) 
XXXV. The Vapour Pressure of Dry Calomel. By Alexander 
Smith and Alan W. C. Menzies. (Abstract), . . 519 
{Issued separately July 7, 1911.) 
XXX YI. The Absorption of Light by Inorganic Salts. No. I. : 
Aqueous Solutions of Cobalt Salts in the Infra-Red. By 
R. A. Houstoun, M.A., Ph.D., D.Sc., Lecturer on Physical 
Optics in the University of Glasgow. ( Communicated 
by Professor A. Gray, F.R.S.), .... 521 
{Issued separately July 8, 1911.) 
XXX YII. The Absorption of Light by Inorganic Salts. No. II. : 
Aqueous Solutions of Cobalt Salts in the Visible Spectrum. 
By R. A. Houstoun, M.A., Ph.D., D.Sc., Lecturer on 
Physical Optics, and Alex. R. Brown, M.A., Thomson 
Experimental Scholar in the University of Glasgow. 
(Communicated by Professor A. Gray, F.R.S.), . . 530 
{Issued separately July 8, 1911.) 
XXXVIII. The Absorption of Light by Inorganic Salts. No. III. : 
Aqueous Solutions of Nickel Salts in the Visible Spectrum 
and the Infra-Red. By R. A. Houstoun, M.A., Ph.D., 
D.Sc., Lecturer on Physical Optics in the University of 
Glasgow. (Communicated by Professor A. Gray, F.R.S.), 538 
{Issued separately July 8, 1911.) 
XXXIX. The Absorption of Light by Inorganic Salts. No. IV. : 
Aqueous Solutions of Cobalt and Nickel Salts in the 
Ultra-Violet. By R. A. Houstoun, M.A., Ph.D., D.Sc., 
Lecturer in Physical Optics, and John S. Anderson, M.A., 
B. Sc., Carnegie Scholar in the University of Glasgow. 
(Communicated by Professor A. Gray, F.R.S.), . . 547 
{Issued separately July 8, 1911.) 
XL. On Fourier’s Repeated Integral. By W. H. Young, 
Sc.D., F.R.S. (Communicated by Professor G. A. Gibson), 559 
{Issued separately July 11, 1911.) 
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