IV 
Contents. 
PAGE 
Mangham, Sydney. —Observations on the Osazone Method of locating Sugars in Plant 
Tissues. With Plate XVII ........... 369 
Groom, Percy. —‘ Brown Oak 1 and its Origin.393 
West, Cyril. —On the Structure and Development of the Secretory Tissues of the Marattiaceae. 
With Plate XVIII and fourteen Figures in the Text.409 
Griffiths, B. Millard. —On Glaucocystis Nostochinearum, Itzigsohn. With Plate XIX . 423 
Wilson, Malcolm. —Sex Determination in Mnium hornum. With Plate XX . . . 433 
Woodburn, William L.—Spermatogenesis in Mnium affine, var. ciliaris (Grev.), C. M. 
With Plate XXI.441 
Small, James. —The Pollen-presentation Mechanism in the Compositae. With seven Figures 
and two Tables in the Text . .. -457 
No. CXVI, October, 1915. 
Woolery, Ruth.—M eiotic Divisions in the Microspore Mother-cells of Smilacina racemosa 
(L.), Desf. With Plate XXII and one Figure in the Text.471 
Brierley, William B.—The ‘ Endoconidia ’ of Thielavia basicola, Zopf. With Plate XXIII 
and one Figure in the Text ........... 483 
Bower, F. O.—-Studies in the Phylogeny of the Filicales. V. Cheiropleuria bicuspis (Bl.), 
Presl, and certain other related Ferns. With Plates XXIV and XXV and nineteen 
Figures in the Text ............. 495 
Bancroft, N.—A Contribution to our Knowledge of Rachiopteris cylindrica, Will. With 
Plates XXVI and XXVII and seventeen Figures in the Text.531 
Worsdell, W. C.—The Origin and Meaning of Medullary (Intraxylary) Phloem in the Stems 
of Dicotyledons. I. Cucurbitaceae. With ten Figures in the Text .... 567 
Affourtit, M. F. A., and La Riviere, H. C. C.-—On the Ribbing of the Seeds of Ginkgo. 
With one Figure in the Text . . ..591 
Beer, Rudolf, and Arber, Agnes.—O n the Occurrence of Binucleate and Multinucleate 
Cells in Growing Tissues ............ 597 
Prankerd, T. L.—Notes on the Occurrence of Multinucleate Cells. With eight Figures in 
the Text.. 599 
Bottomley, W. B.— The Root-nodules of Ceanothus americanus. With Plate XXVIII . 605 
Stiles, Walter, and J0rgensen, Ingvar. —Studies in Permeability. II. The Effect of 
Temperature on the Permeability of Plant Cells to the Hydrogen Ion. With four 
Diagrams in the Text . . . . . . . . . . . .611 
Spratt, Ethel Rose.— The Root-Nodules of the Cycadaceae. With Plate XXIX . .619 
Hunter, C.—The Aerating System of Vicia Faba. With six Figures in the Text . . .627 
Jesson, Enid M.—On the Hairs of the Tomentum and Ovary in Rhododendron Falconeri, 
Hook, f., and Rhododendron Hodgsoni, Hook. f. With one Figure in the Text . 635 
Gwynne-Vaughan, H. C. I.—-Obituary Notice of Ernest Lee (1886-1915) . . . . 639 
