CONTENTS. 
PAGE 
Brannon, M. A. — The Structure and Development of Grinnellia 
americana, Harv. (With Plates I-IV) I 
Richards, H. M. — The Evolution of Heat by Wounded Plants. 
(With Woodcuts i and 2) 29 
Seward, A. C. — A Contribution to our Knowledge of Lyginodendron. 
(With Plates V and VI) 65 
Magnus, P. — On some Species of the Genus Urophlyctis. (With 
Plates VII and VIII) . 87 
Chodat, R. — On the Polymorphism of the Green Algae and the 
Principles of their Evolution 97 
Harvey Gibson, R. J. — Contributions towards a Knowledge of the 
Anatomy of the Genus Selaginella, Spr. : Part III, the Leaf. 
(With Plate IX) 123 
NOTES. 
Lang, W. H. — Preliminary Statement on the Development of 
Sporangia upon Fern Prothalli 157 
Scott, D. H. — On Cheirostrobus, a New Type of Fossil Cone from 
the Calciferous Sandstones 168 
Thiselton-Dyer, W. T.— Note on the Discovery of Mycorhiza . 175 
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