CONTENTS 
No. CXIII, January, 1915. 
PAGE 
Lang, William H.—Studies in the Morphology and Anatomy of the Ophioglossaceae, 
III. On the Anatomy and Branching of the Rhizome of Helminthostachys zeylanica. 
With Plates I—III and eight Figures in the Text ....... 1 
Hoar, Carl S.—A Comparison of the Stem Anatomy of the Cohort Umbelliflorae. With 
Plates IV and V.55 
Skene, Macgregor. —The Acidity of Sphagnum and its Relation to Chalk and Mineral Salts 65 
Stiles, Walter.— On the Relation between the Concentration of the Nutrient Solution and 
the Rate of Growth of Plants in Water Culture.89 
Rayner, M. Cheveley. —Obligate Symbiosis in Calluna vulgaris. With Plate VI and four 
Figures in the Text. 97 
Baden, Margaret L. — Observations on the Germination of the Spores of Coprinus ster~ 
quilinus, Fr. With Plate VII. 135 
Halket, A. C.— The Effect of Salt on the Growth of Salicornia. With Plate VIII and four 
Diagrams in the Text . . ..143 
Matthews, J. R.—Note on Abnormal Flowers in Orchis purpurea, Huds. With four Figures 
in the Text.155 
NOTE. 
Arber, Agnes.— The Anatomy of the Stamens in Certain Indian Species of Parnassia. With 
one Figure in the Text.159 
No. CXIV, April, 1915. 
Sargant, Ethel, and Arber, Agnes. —The Comparative Morphology of the Embryo and 
Seedling in the Gramineae. With Plates IX and X and thirty-five Figures in the Text 161 
Lindsey, Marjorie.— The Branching and Branch Shedding of Bothrodendron. With 
Plate XI and three Figures in the Text ..223 
Browne, Isabel M. P.—A Second Contribution to our Knowledge of the Anatomy of the 
Cone and Fertile Stem of Equisetum. With Plates XII-XIV and five Figures in the 
Text.23! 
Hooker, Henry D., Jr.— Hydrotropism in Roots of Lupinus albus . 265 
West, Cyril, and Lechmere, Arthur Eckley. —On Chromatin Extrusion in Pollen 
Mother-cells of Lilium candidum, Linn. With Plate XV . ..... 285 
Welsford, E. J.—Nuclear Migrations in Phragmidium violaceum. With Plate XVI . . 293 
Willis, J. C. —The Origin of the Tristichaceae and Podostemaceae ..... 299 
NOTES. 
Boodle, L. A.—Abnormal Phyllotaxy in the Ash . 3°7 
Salisbury, E. J.—On the Occurrence of Vegetative Propagation in Drosera. With four 
Figures in the Text .. 308 
Knight, Margery.— Anatomy of the Magnoliaceae . 3 xo 
No. CXV, July, 1915. 
Brown, William. —Studies in the Physiology of Parasitism. I. The Action of Botrytis 
cinerea ..3 l 3 
Stiles, Walter, and Jorgensen, Ingvar.— Studies in Permeability. I. The Exosmosis of 
Electrolytes as a Criterion of Antagonistic Ion-action. With fourteen Figures in the 
Text ’. 
a 2 
349 
