PROCEEDINGS 
OF THE 
ROYAL SOCIETY OF EDINBURGH. 
SESSION 1921-22 
Part I] VOL. XLII, [PP- 1-128 
CONTENTS. 
NO. PAa® 
I. On Tubes of Electromagnetic Force. By Professor E. T. 
Whittaker, F.R.S., 1 
(Issued separately December 27, 1921.) 
II. On the Phenomenon of the ‘‘ Radiant Spectrum ” observed by 
Sir David Brewster. By C. V. Raman, M.A., Palit 
Professor of Physics in the Calcutta University. Com- 
municated by Dr C. G. Knott, F.R.S., General Secretary, 24 
(Issued separately December 27, 1921.) 
III. Prehensility : a Factor of Gaseous Adsorption, By Professor 
Henry Briggs, D.Sc., Ph.D., 26 
(Issued, separately March 14, 1922.) 
IV. Results obtained at the Physical Test Station, Edinburgh. 
By Professor Henry Briggs, D.Sc,, Ph.D., ... 34 
(Issued separately March 14, 1922.) 
V. On the Connexion between Linear Difierential Systems and 
Integral Equations. By E. L. Inge, D.Sc., Lecturer in 
Mathematics in the University of Liverpool. Com- 
municated by Professor E. T. Whittaker, B'.R.S., . 43 
(Issued separately March 24, 1922.) 
VI. Myriapods collected in Mesopotamia and N.W. Persia by 
W. Edgar Evans, B.Sc., late Capt. R.A.M.C. By Henry 
W. Brolemann, Pau (France). Communiccded by Wm. 
Evans, F.F.A., 54 
(Issued separately March 24, 1922.) 
VII. A New Method of investigating Colour Blindness, with a 
Description of Twenty-three Cases. By Dr R. A. 
Houstoun, Lecturer on Physical Optics in the LTniversity 
of Glasgow, . . . . . . . , .75 
(Issued separately May 1, 1922.) 
[Continued on page iv of Cover. 
EDINBURGH: 
Published by ROBERT GRANT & SON, 107 Princes Street, and 
WILLIAMS & NORGATE, 14 Henrietta Street, Covent Garden, London, |^C. 
Frice Fourteen Shillings. 
