CONTENTS. 
PAGE 
Krrshaw, E. M. — Structure and Development of the Ovule of Bowenia spectabilis. With 
Plate LXI and sixteen Figures in the Text . . .625 
Bailey, Irving W.^The Evolutionary History of the Foliar Ray in the Wood of the 
Dicotyledons: and its Phylogenetic Significance. With Plates LXI I and LXIII . 647 
Browne, Isabel M. P.— Contributions to our Knowledge of the Anatomy of the Cone and 
Fertile Stem of Equisetum. With Plates LXIV and LXV and ten Figures in the Text 663 
Beer, Rudolf. — S tudies in Spore Development. II. On the Structure and Division of 
the Nuclei in the Compositae. With Plates LXVI and LXVI I . ..... 705 
Lee, E. — Observations on the Seedling Anatomy of Certain Sympetalae. I. Tubiflorae. 
With Plate LXVI 1 1 and eight Figures in the Text 727 
Bachmann, Freda M. — A New Type of Spermogonium and Fertilization in Collema. 
With Plate LXIX 747 
Blackman, V. H., and Welsford, E. J. — The Development of the Perithecium of 
Polystigma rubrum, DC. With Plates LXX and LXXI 7 6 i 
Schwartz, E. J. — Observations on Asarum europaeum and its Mycorhiza. With Plate 
LXXI I 7 6q 
Holden, H. S.— Some Wound Reactions in Filicinean Petioles. With Plates LXXIII 
and LXXIV and one Figure in the Text 777 
'Betts, Annie S. — A Bee-hive Fungus, Pericystis alvei, Gen. et Sp. Nov. With Plates 
LXXV and LXXVI 795 
Spratt, Ethel Rose.— T he Formation and Physiological Significance of Root Nodules 
in the Podocarpineae. With Plates LXXVII-LXXX ...... 801 
Yapp, R. H.— Spiraea Ulmaria, L., and its Bearing on the Problem of Xeromorphy in 
Marsh Plants. With Plates LXXXI-LXXXIII and eleven Figures in the Text. . 815 
Mockeridge, Florence A.— Some Conditions influencing the Fixation of Nitrogen by 
Azotobacter and the Growth of the Organism 871 
Miller, Edwin C. — A Physiological Study of the Germination of Helianthus annuus. 
II. The Oily Reserve 889 
Brenchley, Winifred E.— The Development of the Grain of Barley. With twenty-two 
Figures in the Text 903 
Lee, D. G.— Notes on the Anatomy and Morphology of Pachypodium namaquanum, 
Welw. With Plate LXXXIV and eight Figures in the Text . . . . . 929 
NOTES. 
Saxton, W. T. — Note on an Abnormal Prothallus of Pinus maritima, L. With one 
Figure in the Text 943 
Dummer, R. A.' — Peloria in Saintpaulia ionantha, Wendland, and Chorisis in Aristea 
dichotoma. With three Figures in the Text . 946 
Clark, J. J.— Abnormal Flowers of Amelanchier spicata. With twelve Figures in the . 
Text 948 
Johnson, J. Charles.— O n Well-marked Aerotropic Growths of Bacillus megatherium 949 
Gibson, R. J. Harvey. — T he Extent of the Root-system of Cucumis sativus . . 951 
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