CONTENTS 
' PAGE 
David Thomas Gwynne-Vaughan. With Portrait i-xxiv 
Willis, J. C. — The Evolution of Species in Ceylon, with reference to the Dying Out of 
Species. With two Figures in the Text i 
Leitch, I. — Some Experiments on the Influence of Temperature on the Rate of Growth 
in Pisum sativum. With Plate I and ten Figures in the Text 25 
Laidlaw, C. G. P., and Knight, R. C. — A Description of a Recording Porometer and 
a Note on Stomatal Behaviour during Wilting. With three Figures in the Text . 47 
Knight, R. C. — On the Use of the Porometer in Stomatal Investigation. With seven 
Figures in the Text ............. 57 
Brenchley, Winifred E.— The Effect of the Concentration of the Nutrient Solution on 
the Growth of Barley and Wheat in Water Cultures. With Plate II and four Diagrams 
in the Text 77 
Barratt, Kate. — T he Origin of the Endodermis in the Stem of Hippuris. With six 
Figures in the Text 91 
Davie, R. C. — The Development of the Sorus and Sporangium and the Prothallus of 
Peranema cyatheoides, D. Don. With Plate III and two Figures in the Text . . 101 
Stopes, Marie C. — An Early Type of the Abietineae (?) from the Cretaceous of New 
Zealand. With Plate IV and seven Figures in the Text . . . . . .111 
Holden, H. S. — Further Observations on the Wound Reactions of the Petioles of Pteris 
aquilina. With four Figures in the Text . . . . . . . . .127 
FritsCH, F. E. — The Morphology and Ecology of an Extreme Terrestrial Form of 
Zygnema (Zygogonium) ericetorum (Kuetz.), Hansg. With three Figures in the Text 135 
Takeda, H. — Dysmorphococcus variabilis, gen. et sp. nov. With fifteen Figures in the Text 1 5 1 
Takeda, H.— Scourfieldia cordiformis, a New Chlamydomonad. With five Figures in 
the Text .... ........ ... 157 
Stapledon, R. G. — On the Plant Communities of Farm Land . ..... 161 
Fraser, Mary T. — Parallel Tests of Seeds by Germination and by Electrical Response. 
(Preliminary Experiments.) 1 8 1 
NOTES. 
Small, James. — A nomalies in the Ovary of Senecio vulgaris, L. With three Figures 
in the Text . 19 1 
Doyle, Joseph. — N ote on the Structure of the Ovule of Larix leptolepis. With one 
Figure in tfie Text . . . . . . . . . . . . 193 
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