PROCEEDINGS 
OF THE 
ROYAL SOCIETY OF EDINBURGH. 
SESSION 1907-8. 
Part V.] VOL. XXVIII. [PP- 337-432. 
CONTENTS. 
NO. PAGE. 
XIX. A Preliminary Notice of Five New Species of Iron- 
Bacteria. By David Ellis, Ph.D. (Marburg), D.Sc. 
(London), F.R.S.E., Lecturer in Botany and Bacteri- 
ology, Glasgow and West of Scotland Technical College, 
Glasgow. With Three Plates, . . . . 338 
{Issued 'separately June 13, 1908.) 
XX. The Arterial Pressure in Alan. I. : Methods. By G. A. 
Gibson, M.D, D.Sc., LED, F.R.C.P.Ed. . . . 343 
{Issued separately June 22, 1908.) 
XXI. Preliminary Statement on the Morphology of the Cone of 
Lycopodium cernuum and its bearing on the affinities 
of Spencerites. By William H. Lang, ALB., D.Sc., 
Lecturer in Botany, Glasgow University. ( Communi- 
cated by Professor F. 0. Boweb, Sc.D., F.R.S.L. and E.), 356 
{Issued separately June 22, 1908.) 
XXII. Note on the Electrical Resistance of Spark Gaps. By 
Robebt A. Houstoun, Ph.D., D.Sc. {Communicated 
by Professor A. Gbay, F.R.S.), . . . . 369 
{Issued separately July 20, 1908.) 
[ Continued on page iv of Cover. 
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