TRANSACTIONS 
OF THE 
ROYAL SOCIETY OF EDINBURGH. 
VOLUME LI I, PART I.— SESSION 1917-18. 
CONTENTS. 
I. On the Leaf-Trace in some Pinnate Leaves. By 1’. C. Davie, M.A., D.Sc., Lecturer in Botany 
in the University of Edinburgh. Communicated by Dr R. Kidston, F.R.S. ("With One 
Plate), . . . . • ... 
( Issued February 16, 1917.) ' 
Tl. The Insert Association of a Local Environmental Complex in the District of Holmes Chapel, 
.Cheshire. By Alfred E. Cameron, M.A., D.Sc. (Aberd.-), M.Sc. (Viet.); Field Officer, 
Entomological BraUch, Department of Agriculture, Canada ; late Government Scholar of 
the Department of Agricultural Entomology, Manchester University. Communicated by 
Dr R. Stewart MaoDougall, (With Two Plates), . 7 . 
III. The GametophyCe of Psilotum 
Professor Anstruther Lawson, D.Sc. 
( Issued April 4, 1917.) 
By G. P. Darnell-Smith, B.Sc., F.I.C. 
(With Two Plates), 
(Issued May 23, 1917.) 
Communicated by 
IV. The Gametophyte Generation of the Psilotacese. By A. Anstruther Lawson, D.Sc., Professor 
of Botany, University of Sydney. (With Five Plates), ..... 
(Issued June 13, 1917.) 
V. The Moulting of the King Penguin (Aptenodytes patagouica). By Professor J. Cossar 
Ewart, F.R.S., and Dorothy Mackenzie, F.S.Z.S. (With Two Plates), 
( Issued June 14, 1917.) 
VI. The Anatomy and Affinity of Stromatopteris moniliformis, Mett. By John M"‘Lean Thompson, 
M.A., D.Sc., Senior Assistant to the Professor of Botany, and late Robert Donaldson 
Research Scholar, Glasgow University.- Communicated by Professor F. O. Bower, 
Sc.I)., F.R.S. (With Four Plates, and Figures in the Text), .... 
(Issued June 15, 1917.) 
VII. A Further Contribution to the Knowledge of Platyzoma microphyllum B. Br. By John 
M‘Lean Thompson, M.A., D.Sc., Glasgow University. (With Seventeen Figures in the 
Text), . . . - . i 
(Issued October 5, 1917.) 
By Frank Robbins, F.R.A.S. 
VIII. Factorials and Allied Products with their Logarithms. 
Communicated by Professor Whittaker, ....... 
(Issued October 20, 1917.) 
IX. The Highland Border Rocks of the Aberfoyle District. By Professor T. J. Jehu and Dr Robert 
Campbell. (With Six Plates and Ten Text-figures), . . . 
_ (Issued December 4, 1917.) 
X. The Structure, Bionomics, and Forest Importance of Myelophilus minor, Hart. By Walter 
Ritchie, B.Sc., B.Sc. (Agr.). ; Fullerton Scholar, University of Aberdeen; Research 
Scholar, University of Edinburgh. Communicated by Dr R. Stewart MacDougall. 
(With Two Plates), . . • . 
(Issued December 4, 1917.) 
XI. On Knots, with a Census of the Amphicheirals with Twelve Crossings. By Mary Gertrude 
Haseman. Communicated by Dr C. G. Knott, General Secretary. (With One Plate), . 
(Issued February 1, 1918.) 
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