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CONTENTS. 
No. CIX, January, 1914. 
PAGE 
Harper, R. A., and Dodge, B. O. — The Formation of the Capillitium in Certain Myxo- 
mycetes. With Plates I and II 1 
Lang, William H. — Studies in the Morphology and Anatomy of the Ophioglossaceae. 
II. On the Embryo of Helminthostachys. With Plate III and nine Figures in the 
Text T 9 
Salisbury, E. J. — On the Structure .and Relationships of Trigonocarpus Shorensis, sp. nov. 
A New Seed from the Palaeozoic Rocks. With Plates IV and V and eight Figures in 
the Text 39 
Arber, E. A. Newell. — A Revision of the Seed Impressions of the British Coal Measures. 
With Plates VI-VIII and eight Figures in the Text .81 
Blackman, V. H., and Paine, S. G. — A Recording Transpirometer. With two Figures 
in the Text 109 
Mottier, David M. — Mitosis in the Pollen Mother-cells of Acer negundo, L., and 
Staphylea trifolia, L. With Plates IX and X 115 
Knight, R. C., and Priestley, J. H. — The Respiration of Plants under Various Electrical 
Conditions. With six Figures in the Text 135 
Kashyap, Shiv Ram. — T he Structure and Development of the Prothallus of Equisetum 
debile, Roxb. With forty-five Figures in the Text 163 
Le Goc, M. J. — Observations on the Centripetal and Centrifugal Xylems in the Petioles of 
Cycads. With Plate XI and one Figure in the Text 183 
NOTE. 
Arber, Agnes. — A Note on Trigonocarpus. With one Figure in the Text .... 195 
No. CX, April, 1914. 
Brown, Horace T. — Some Studies on Yeast. With eight Figures in the Text . . . 197 
Schwartz, E. J. — The Plasmodiophoraceae and their Relationship to the Mycetozoa and 
the Chytrideae. With Plate XII . 227 
Poulton, Ethel M. — The Structure and Life-history of Verrucaria margaceae, Wahl., 
an Aquatic Lichen. With Plates XIII and XIV . 241 
de Fraine, E. — On Medullosa centrofilis, a New Species of Medullosa from the Lower Coal 
Measures. With Plate XV and five Figures in the Text 251 
Welsford, E. J. — The Genesis of the Male Nuclei in Lilium. With Plates XVI and XVII . 265 
Reed, T. — The Nature of the Double Spireme in Allium Cepa. With Plates XVIII and 
XIX 271 
Brenchley, Winifred E. — On the Action of Certain Compounds of Zinc, Arsenic, and 
Boron on the Growth of Plants. With seventeen Figures in the Text . . .283 
Lee, E. — Observations on the Seedling Anatomy of Certain Sympetalae. II. Compositae. 
With eleven Diagrams and two Figures in the Text . . ..... 303 
Robinson, WYlfrid. — S ome Experiments on the Effect of External Stimuli on the Sporidia of 
Puccinia malvacearum (Mont.). With seven Figures in the Text .... 331 
Stopes, Marie C. — A New Araucarioxylon from New Zealand. With Plate XX and three 
Figures in the Text 341 
Gwynne-Vaughan, D. T. — On a ‘ Mixed Pith’ in an Anomalous Stem of Osmunda regalis. 
With Plate XXI 351 
Green, M. L. — Note on Anomalous Bulbils in a Lily. With two Figures in the Text . . 355 
Hill, T. G., and de Fraine, E. — On the Classification of Seed-Leaves ..... 359 
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