PAGE 
CONTENTS. 
Williams, J. Lloyd— Studies in the Dictyotaceae. II. The Cytology 
of the Gametophyte Generation. With Plates XII, XIII, 
and XIV ........... 183 
Bower, F. O. — Ophioglossum simplex, Ridley. With Plate XV . 205 
Parkin, J. — The Extra- floral Nectaries of Hevea brasiliensis, Miill.- 
Arg. (the Para Rubber Tree), an Example of Bud-Scales serving 
as Nectaries. With Plate XVI . . . . . .217 
Church, A. H. — The Principles of Phyllotaxis. With seven Figures 
in the Text ........... 227 
Mottier, D. M. — The Development of the Spermatozoid in Chara. 
With Plate XVII ......... 245 
Weiss, F. E.— A Mycorhiza from the Lower Coal-Measures. With 
Plates XVIII and XIX and a Figure in the Text . . . 255 
Reed, H. S.— A Study of the Enzyme-secreting Cells in the Seedlings 
of Zea Mais and Phoenix dactylifera. With Plate XX . , 267 
Vines, S. H. — The Proteases of Plants 289 
NOTES. 
Massee, G.— On the Origin of Parasitism in Fungi . . , .319 
Salmon, E. S. — Cultural Experiments with ‘ Biologic Forms’ of the 
Erysiphaceae 320 
Oliver, F. W., and Scott, D. H.— On the Structure of the Palaeozoic 
Seed Lagenostoma Lomaxi, with a Statement of the Evidence 
upon which it is referred to Lyginodendron . . . . 321 
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