S?0.5M1 
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CONTENTS. 
No. XLI, March, 1897. 
PAGE 
Brannon, M. A.— *The Structure and Development of Grinnellia 
americana, Harv. (With Plates I-IV) ..... 1 
Richards, H. M. — The Evolution of Heat by Wounded Plants. (With 
Woodcuts 1 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 : Part III, The Leaf. (With 
Plate IX) v . . . . 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 
Thistelton-Dyer, W. T. — Note on the Discovery of Mycorhiza . 175 
No. XLII, June, 1897. 
Clifford, J. B. — Notes on some Physiological Properties of a Myxo- 
mycete Plasmodium. (With Woodcuts 3, 4, 5) . . .179 
Sargant, E. — The Formation of the Sexual Nuclei in Lilium Martagon : 
II, Spermatogenesis. (With Plates X and XI) . . .187 
Massee, G. — A Monograph of the Geoglosseae. (With Plates XII 
and XIII) 225 
Gwynne-Vaughan, D. T. — On Polystely in the Genus Primula. 
(With Plate XIV) 307 
Scott, D. H. — On two new instances of Spinous Roots. (With 
Plates XV and XVI) 327 
NOTES. 
Ellis, W. G. P. — Fungi for Class-Demonstration .... 333 
Biffen, R. H. — The Functions of Latex ...... 334 
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