IV 
Contents. 
PAGE 
Mottier, David M. — On Certain Plastids, with Special Reference to the Protein Bodies of 
Zea, Ricinus, and Conopholis. With Plate XV 349 
Gates, R. Ruggles, and Rees, E. M. — A Cytological Study of Pollen Development in 
Lactuca. With Plates XVI-X 1 X 365 
Dastur, Jehangir Fardunji. — C ytology of Tilletia Tritici, (Bjerk.) Wint. With Plate XX 
and nine Figures in the Text . 399 
Cutting, E. M. — Observations on Variations in the. Flowers of Stachys sylvatica, Linn. 
With five Figures in the Text 409 
Browne, Isabel' M. P. — A Fourth Contribution to our Knowledge of the Anatomy of the 
Cone and Fertile Stem of Equisetum. With Plate XXI and twelve Figures in 
the Text . 427 
NOTES. 
Chandler, M. E. J. — Note on the Occurrence of Sequoia in the Headon Beds of Hordwell, 
Hants 457 
Horne, Arthur S. — Phloem Necrosis (Brown Bast Disease) in Hevea brasiliensis . . 457 
No. CXL, October, 1921. 
Holden, H. S., and Daniels, Margaret E. — Observations on the Anatomy of Teratological 
Seedlings. IV. Further Studies on the Anatomy of Atypical Seedlings of Impatiens 
Roylei, Walp. With ninety-seven Figures in the Text . . . . . .461 
Willis, J. C. — Endemic Genera of Plants in their Relation to Others. With six Diagrams 
in the Text .......... .... 493 
Guppy, H. B.— The Testimony of the Endemic Species of the Canary Islands in Favour of 
the Age and Area Theory of Dr. Willis . . . . . . . . • 5 I 3 
Taylor, Norman. — E ndemism in the Bahama Flora. With one Map in the Text . *523 
Brenchley, Winifred E., and Jackson, Violet G. — Root Development in Barley and 
Wheat under Different Conditions of Growth. With four Figures in the Text . . 533 
Waterhouse, W. L. — Studies in the Physiology of Parasitism. VII. Infection of Barberis 
vulgaris by Sporidia of Puccinia graminis. With nineteen Figures in the Text . 557 
Hatfield, E. J. — Anatomy of the Seedling and Young Plant of Macrozamia Fraseri. With 
Plate XXII and eight Figures in the Text 565 
Thoday, D. — On the Behaviour during Drought of Leaves of two Cape Species of Passerina, 
with some Notes on their Anatomy. With thirteen Figures in the Text . . *585 
Williams, J. Lloyd. — T he Gametophytes and Fertilization in Laminaria and Corda (Pre- 
liminary Account) 603 
Edwards, W. N.' — Fossil Coniferous Wood from Kerguelen Island. With Plate XXIII and 
four Figures in the Text 609 
