CONTENTS. 
PAGE 
Engler, A. — Plants of the Northern Temperate Zone in their 
Transition to the High Mountains of Tropical Africa . . 523 
Trow, A. H. — On Fertilization in the Saprolegnieae. With Plates 
XXXIV-XXXVI . . . . . . - . . .541 
Lang, W. H. — On a Prothallus provisionally referred to Psilotum. 
With Plate XXXVII 571 
Burns, G. P. — Heterophylly in Proserpinaca palustris, L. With 
Plate XXXVIII 579 
Ford, Miss S. O. — The Anatomy of Psilotum triquetrum. With 
Plate XXXIX .......... 589 
Wolfe, J. J.— Cytological Studies on Nemalion. With Plates XL 
and XLI and a Figure in the Text 607 
Ganong, W. F. — An undescribed Thermometric movement of the 
Branches in Shrubs and Trees. With six Figures in the Text 631 
NOTES. 
Wigglesworth, Miss G. — The Papillae in the epidermoidal layer of 
the Calamitean root. With three Figures in the Text . .645 
Fritsch, F. E. — Algological Notes. No. 5 : Some points in the 
structure of a young Oedogonium. With a Figure in the Text 648 
Pertz, D. F. M. — On the Distribution of Statoliths in Cucurbitaceae 653 
Hill, T. G. — On the presence of a Parichnos in Recent Plants . . 654 
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