PAGE 
CONTENTS. 
BOWER, F. O.— Studies in the Phytogeny of the Filicales. VII. The Pteroideae. With 
forty-three Figures in the Text . . . '.. i 
Blackman, V. H., and Paine, S. G.—Studies in the Permeability of the Pulvmus of 
Mimosa pudica. With five Figures in the Text. 69 
Arber, Agnes.-— Further Notes on Intrafascicular Cambium in Monocotyledons. With 
four Figures in the Text ..... 87 
Mottier, David M.—Chondriosomes and the Primordia of Chloroplasts and Leuco- 
plasts. With Plate I ....... ... • 91 
MURPHY, Paul A.— The Morphology and Cytology of the Sexual Organs of Phyto- 
phthora erythroseptica, Pethyb. With Plates II and III. .115 
Weston, William H.—The Development of Thaustotheca, a Peculiar Water-Mould.. 
With Plates IV and V and two Figures in the Text . „ . . . . c 155 
NOTE. 
Paine, S. G., and Saunders, L. M.—On a Peculiarity exhibited by the Testa of 
Wrinkled Peas . . . . . . . . 175 
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