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TRANSACTIONS 
ROYAL SOCIETY OF EDINBURGH. 
VOLUME LII, PART III.— SESSION 1919-20. 
CONTENTS. 
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XXIII. Amphicheiral Knots. By Mary Gertrude Haseman, Ph.D. 
■ " C. G. Knott, General Secretary.' (With One Plate), - 
(issued December 22, 1919.) 
Communicated by Dr 
XXV. Theoretical Determination of the Longitudinal Seiches of Lake Geneva. By A. T. Doodson, 
R. M. Carey, and R. Baldwin, Tidal Institute, University of Liverpool. Communicated 
by Dr E. M. Wedderburn, ........ 
(Issued April 2, 1920.) 
PAUB ^ 
XIX. Contributions toivards a Knowledge of the Anatomy of the Lower Dicotyledons. II. The 
Anatomy of the Stem of the Berberidacese. By R. J. Harvey-Gibson, C.B.E., D.L., 
M.A., Professor of Botany, University of Liverpool ; and Elsie Horsman, M.Sc. (With 
One Plate), .......... 501 
(Issued May 21, 1919.) 
XX. Contributions towards a Knowledge of the Anatomy of the Lower Dicotyledons. III. The 
Anatomy of the Stem of the Calycanthacex. By Christine E. Quinlan, M.Sc., 
University College, Cork. Communicated by Professor R. J. Harvey-Gibson, C.B.E., 
D. L., M.A. (With One Plate), . ....... 517 
(Issued May 21, 1919.) 
XXI. The Comparative Myology of the Shoulder Girdle and Pectoral Fin of Fishes. By Captain 
E. W. Shann, B.Sc., Oundle School. Communicated by Professor W. C. MTntosh, 
F. R.S. (With Four Plates and One Figure in the Text), . . . .531 
(Issued September 26, 1919.) 
XXII. The Morphology of the Stele of Platyzoma microphyllum, R. By. By John M'Lean 
Thompson, M.A., D.Sc., F.L.S., Lecturer on Plant Morphology, Glasgow University. 
(With Three Plates and Three Figures in the Text), . . . . .571 
(Issued September 29, 1919.) 
597 
XXIV. On Old Red Sandstone Plants showing Structure, from the Rhynie Chert Bed , Aberdeenshire. 
Part 11. Additional Notes on Rhynia Gwynne-Vaughani, Kidston and Lang ; ivith 
Descriptions of Rhynia major, n.sp., and Hornea Lignieri, n.g., n.sp. By R. Kidston, 
LL.D., F.R.S. , and W. H. Lang, D.Sc., F.R.S., Barker Professor of Cryptogamic Botany 
in the University of Manchester. (With Ten Plates), ..... 603 
(Issued January 20, 1920.) 
629 
XXVI. On Old Red Sandstone Plants showing Structure, from the Rhynie Chert Bed, Aberdeenshire. 
Part 111. Asteroxylon Mackiei, Kidston and Lang. By R. Kidston, LL.D., F.R.S., 
and W. H. Lang, D.Sc., F.R.S., Barker Professor of Cryptogamic Botany in the 
University of Manchester. (With Seventeen Plates), ..... 643 
(Issued May 11, 1920.) 
EDINBURGH: 
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