PAGE 
I 
CONTENTS. 
Evans, A. W.— Branching in the Leafy Hepaticae. With thirty-six Figures in the Text . 
Scott, D. H. — .On a Palaeozoic Fern, the Zygopteris Grayi of Williamson. With Plates 
I-V and one Figure in the Text ... ....... 
MacDougal, D. T. — The Water-balance of Desert Plants. With Plants VI-X 
Brenchley, Winifred E.— The Weeds of Arable Land in relation to the Soils on which 
they grow. II ........... 
Bottomley, W. B. — The Root-nodules of Myrica Gale. With Plates XI and XII . 
Spratt, Ethel R. — The Morphology of the Root Tubercles of Alnus and Elaeagnus, and 
the Polymorphism of the Organism causing their Formation. With Plates XIII 
and XIV 
Dale, Elizabeth. — On the Cause of ‘ Blindness ’ in Potato Tubers . . 
Dale, Elizabeth.— A Bacterial Disease of Potato Leaves. With Plates XV and XVI 
Bliss, Mary C. — A Contribution to the Life-history of Viola. With Plates XVII-XIX 
Holden, Ruth. — Reduction and Reversion in the North American Salicales. With 
Plates XX and XXI ... 
Hill, T. G., and de Fraine, Ethel.— On the Seedling Structure of certain Centro- 
spermae. With eight Figures and seven Diagrams in the Text ..... 
Benson, Margaret.— Cordaites Felicis, sp. nov.,a Cordaitean Leaf from the. Lower Coal 
Measures of England. With Plate XXII and one Figure in the Text 
Barrett, J. T. — Development and Sexuality of some Species of Olpidiopsis, (Cornu) 
Fischer. With Plates XXII I-XXVI 
Welsford, Evelyn J. — The Morphology of Trichodiscus elegans,. Gen. et Sp. Nov. 
NOTE. 
Compton, R. H. — Note on a Case of Doubling of Embryo-sac, Pollen-tube, and 
Embryo . 
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