PROCEEDINGS 
OF THE 
ROYAL SOCIETY OF EDINBURGH. 
SESSION 1908-9. 
Part II.] 
VOL. XXIX. 
[Pp. 65-128. 
CONTENTS. 
NO. 
IV. On a Question in Absorption Spectroscopy. By Robert A. 
Houstoun, M.A., Ph.D., D.Sc., assisted by Alexander S. 
Russell, M.A. {Communicated by Professor A. Gray), 
{Issued separately December 22, 1908.) 
Y. Dissymmetrical Separations in the Zeeman Effect in Tungsten 
and Molybdenum. By Robert Jack, M.A., B.Sc., Ph.D., 
1851 Exhibition Research Scholar. {Communicated by 
Professor A. Gray), ...... 
{Issued separately December 30, 1908.) 
YI. On the Reducing Action of Electrolytic Hydrogen on Arsenious 
and Arsenic Acids when liberated from the Surface of 
Different Elements. By William Thomson, F.I.C., . 
{Issued separately January 21, 1909.) 
PAGE 
68 
75 
84 
YII. Preliminary Note on the Action of Nitric Anhydride on 
Mucic Acid. By Professor A. Crum Brown, F.R.S., and 
G.*E. Gibson, B.Sc., ...... 96 
{Issued separately February 19, 1909.) 
{Continued on page iv of Cover. 
EDINBURGH : 
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