PAGE 
CONTENTS. 
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 ..I 
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 
sterquilinus, 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 
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