64 Annals of Botany . 
Worsdell, W. C. — On the Comparative Anatomy of certain Species of 
the genus Christisonia (with Plates V and VI), ix. 103. 
The Anatomy of the Stem of Macrozamia compared with that of 
other Genera of Cycadeae (with Plates XXVII and KXVIII), x. 601. 
Wright, C. H. — On the Double Flower of Epidendrum vitellinum, 
Lindl. (with Plate XXIII), viii. 453. 
Wulfsberg, Nils Gregers Ingvald. Obituary notice, iii. 435. 
X. 
Xanthophyll, iii. 97, 112 et seq. 
Xanthosoma sp., laticiferous tissue in leaf, iii. 447. 
Y. 
Yeast-cells, Experimental Studies in the Variation of (E. C. Hansen), 
ix. 549. 
Yucca, description of vascular bundle, vii. 25 ; sliding growth of 
tracheides, vii. 26; the development of secondary tracheides in (*), 
vii. 21. 
Yuccites, notes on (t), x. 210. 
Z. 
Zahlbruckner, A., and Hemsley, W. B.— The genus Trematocarpus, 
vii. 289. 
Zaluzianskya coriacea, pollination (*), v. 368. 
Zamia Loddigesii, external appearance of stem (*), x. 218. 
Skinneri, external appearance of stem (*), x. 218. 
Zanthoxylum alatum, glands (*), vi. 157 ; thorns (*), vi. 156 et seq. 
cork-formation in thorns (*), vi. 160. 
On the Nature and Development of the Corky Excrescences on 
Stems of (C. A. Barber) (*), vi. 1^5. 
dimorphophyllum, description, ix. 150. 
echinocarpum, description, ix. 149. 
emarginellum, description, ix. 149. 
fraxinoides, description, ix. 148. 
micranthum, description, ix. 147. 
stenophyllum, description, ix. 147. 
undulatifolium, description, ix. 148. 
Zea Mais, correlation in the growth of roots and shoots, viii. 269 ; trauma- 
tropic curvature of roots (*), viii. 436. 
Zeuxine formosana, description, ix. 158. 
Zingiberaceae, development of the seed in (*), x. 21. 
Zymogens, an account of, vii. 121. 
Zymon, preparation, &c., ix. 195. 
