CONTENTS. 
PAGE 
Harper, R. A., and Dodge, B.O. — The Formation of the Capillitium in Certain Myxo- 
mycetes. With Plates I and II i 
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 19 
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 
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