CONTENTS. 
PAG K 
Brown, Horace T. — Some Studies on Yeast. With eight Figures in the Text . . ' 197 
Schwartz, E. J.— The Plasmodiophoraceae and, their Relationship to the Mycetozoa and 
the Chytrideae. With Plate XII 227 
POULTON, Ethel M. — The Structure and Life-history of Verrucaria margacea Wahl., 
an Aquatic Lichen. With Plates XIII and XIV . 241 
DE Train E, E.— On Medullosa centrofilis, a New Species of Medullo^a from the Lower 
Coal Measures. With Plate XV and five Figures in the Text 251 
WELSFORD, E. J.— The Genesis of the Male Nuclei in Lilium. With Plates XVI and 
XVII . . . . . .265 
Reed, T. — The Nature of the Double Spireme in Allium Cepa. With Plates XVIII 
and XIX . . . .271 
Brencheey, WINIFRED E.— On the Action of Certain Compounds of Zinc, Arsenic, and 
Boron on the Growth of Plants. With seventeen Figures in the Text . . . . 283 
Lee, E. — Observations on the Seedling Anatomy of Certain Sympetalae. II. Compositae. 
With eleven Diagrams and two Figures in the Text . . . . . . . 303 
Robinson, Wilfrid.— S ome Experiments on the Effect of External Stimuli on the 
Sporidia of Puccinia malvacearum (Mont.). With seven Figures in the Text . . 331 
Stopes, Marie C. — A New Araucarioxylon from New Zealand. With Plate XX and 
three Figures in the Text . . . . 341 
Gwynne-Vaughan, D. T. — On a ‘Mixed Pith’ in an Anomalous Stem of Osmunda 
regalis. With Plate XXI . 351 
GREEN, M. L. — Note on Anomalous Bulbils in a Lily. With two Figures in the Text . 355 
Hill, T. G., and de Fraine, E.— On the Classification of Seed-Leaves . . . . 359 
NOTICE TO SUBSCRIBERS. 
The subscription-price of each volume is thirty shillings, payable in advance : the 
Parts, four in number, are supplied as they appear, post free to subscribers in the United 
Kingdom, and with a charge of is. 6d. per annum for postage to subscribers residing 
abroad. The price of individual Parts is fixed at a higher rate. Intending subscribers 
should send their names, with subscription, to Humphrey Milford, Oxford University Press, 
Amen Corney, London, E.C. 
As the earlier volumes of the Annals of Botany are becoming scarce, Vol. I will 
only be sold as part of a complete set ; and Parts will not as a rule be sold separately, 
after the publication of the volume to which they belong. A few extra copies of particular 
Parts at present remain on hand, for which special application must be made to the 
Editors, Clarendon Press, Oxford. 
NOTICE TO CONTRIBUTORS. 
In future, English contributors should address their papers to Professor 
F. W. Oliver, University College, Gower Street, London, W.C. ; and 
contributors in America to Professor R. Thaxter, Harvard University, 
Cambridge, Mass. 
Papers sent in with a view to publication must be type-written and must conclude ivith 
a summary of the contents. In view of the increasing numbers of manuscripts submitted 
and the inevitable limitations of space, the Editors desire to impress upon contributors 
the importance of conciseness in the treatment of their subject-matter. Whilst they are 
not prepared at present to draw a hard and fast line, the Editors suggest that the longer 
papers should not exceed 12,000 words. 
Illustrations. These where possible should be suitable for reproduction as line- 
blocks in the text. Where lithographic or collotype plates are required the figures should 
be planned so as to fill properly a qto or an 8vo plate. The maximum space available 
for figures in a 4D plate is 8JxnJ inches, in an 8vo plate 8^x5^ inches. Attention 
to this will conduce to the rapid publication of papers if accepted. 
Each contributor to the Annals of Botany is entitled to receive gratis one hundred 
separate copies of his paper, and may purchase additional copies if he informs the Editors of 
his wishes in this respect when he returns corrected proofs. The price of these additional 
copies will depend upon the amount of text and the number of plates in the paper. 
