CONTENTS. 
PAGE 
Prain, Sir David.— -The Mercurialineae and Adenoclineae of South Africa . . .371 
Baker, Sarah M. — Quantitative Experiments on the Effect of Formaldehyde on Living 
Plants. With Plates XXX and XXXI and four Figures in the Text . . . .411 
Bower, F. O. — Studies in the Phylogenyof the Filicales. III. On Metaxya and certain other 
relatively primitive Ferns. With Plates XXXII-XXXIV and two Figures in the Text 443 
Hill, Arthur W. — The Floral Mechanism of the Genus Sebaea. With Plate XXXV 
and two Figures in the Text 479 
Arber, AGNES. — On the Structure of the Androecium in Parnassia and its bearing on 
the Affinities of the Genus. With Plate XXXVI and four Figures in the Text . . 491 
Black, Caroline A. — The Morphology of Riccia Frostii, Aust. With Plates XXXVII 
and XXXVIII 511 
Holden, Ruth. — Contributions to the Anatomy of Mesozoic Conifers. No. I. Jurassic 
Coniferous Woods from Yorkshire. With Plates XXXIX and XL . . . -533 
Takeda, H. — Morphology of the Bracts in Welwitschia mirabilis. With Plate XLI and 
two Figures in the Text 547 
Fraser, H. C. I. (Mrs. D. T. Gwynne-Vaughan). — The Development of the Ascocarp 
in Lachnea cretea. With Plates XLII and XLIII 553 
Thoday, D. — On the Capillary Eudiometric Apparatus of Bonnier and Mangin for the 
Analysis of Air in investigating the Gaseous Exchanges of Plants. With two Figures 
in the Text 565 
NOTE. 
Bartlett, A. W. — Note on the Occurrence of an Abnormal Bisporangiate Strobilus 
of Larix europaea, DC. With two Figures in the Text 575 
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