CONTENTS. 
PAGE 
Mottier, D. M. — The Effect of Centrifugal Force upon the Cell. 
(With Plate XVIII.) 325 
Biffen, R. H.— A Fat-Destroying Fungus. (With Plate XIX.) . 363 
Boodle, L. A. — On some points in the Anatomy of the Ophioglosseae. 
(With Plate XX.) .377 
De Vries, H.— On Biastrepsis in its Relation to Cultivation . . 395 
F ARMER, J. B., AND F reeman, W. G.— On the Structure and Affinities of 
Helminthostachys zeylanica. (With Plates XXI-XXIII.) 421 
HarTog, W. M. — The Alleged Fertilization in the Saprolegnieae . 447 
NOTES. 
Hanna, H. — -The Plurilocular Sporangia of Petrospongium Berkeleyi. 
(With Figure) . 461 
Ito, T. — Some remarkable Marine Monocotyledons in Japan . . 464 
Rhizophoreae in Japan 465 
Floating- Apparatus of the Leaves of Pistia Stratiotes, L. . 466 
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