IV 
Contents . 
PAGE 
Willis, J. C. — Further Evidence for Age and Area ; its Applicability to the Ferns, &c. . 335 
KNIGHT, R. C. — ‘ Relative Transpiration ’ as a Measure of the Intrinsic Transpiring Power of 
the Plant 351 
West, Cyril. — A Contribution to the Study of the Marattiaceae. With Plates XXI and 
XXII and thirty-three Figures in the Text . . . . . . . *361 
Stiles, Walter, and Jorgensen, Ingvar. — Studies in Permeability. V. The Swelling of 
Plant Tissue in Water and its Relation to Temperature and various Dissolved Sub- 
stances. With ten Tables and nine Figures in the Text ...... 415 
Potter, M. C. — Note on a Method of demonstrating the Heat of Respiration. With one 
Figure in the Text 435 
Kashyap, Siiiv Ram. — Notes on Equisetum debile, Roxb. With three Figures in the Text . 439 
Brenchley, Winifred E. — Organic Plant Poisons. 1 . Hydrocyanic Acid. With three 
Figures in the Text 447 
Kidd, Franklin, and West, Cyril. — The Controlling Influence of Carbon Dioxide. 
IV. On the Production of Secondary Dormancy in Seeds of Brassica alba following 
Treatment with Carbon Dioxide, and the Relation of this Phenomenon to the Question 
of Stimuli in Growth Processes. With Plate XXIII and five Figures in the Text . 457 
Brown, William. — Studies in the Physiology of Parasitism. IV. On the Distribution of 
Cytase in Cultures of Botrytis cinerea ......... 489 
Maybrook, A. C. — On the Haustoria of Pedicularis vulgaris, Tournef. With five Figures in 
the Text 499 
Piercy, Alma. — The Structure and Mode of Life of a Form of Hormidium flaccidum, 
A. Braun. With three Tables and six Figures in the Text .... 513 
