42 
Annals of Botany. 
Wounded plants, evolution of heat by, xi. 29. 
Wounding, effect of previous, on flowof latex, 
xiv. 204. 
Wound reactions of Brachyphyllum (* +), 
xx. 383. 
Wright, H. — Foliar periodicity in Ceylon, 
xvi. 594. 
X. 
Xylem of woody stems, occurrence of cellu- 
lose in (*), xviii. 121. 
Y. 
Yapp, R. H. — Fruit-dispersal in Adeno- 
stemma viscosum. A Biological Study 
(Plate XXIII), xx. 311. 
— Two Malayan ‘ Myrmecophilous ’ Ferns, 
Polypodium (Lecanopteris) carnosum and 
Polypodium sinuosum (Plates X-XII), 
xvi. 185. 
Yeast, alcoholic enzyme, xi. 555, xii. 491 ; 
autolysis, xviii. 294 ; peptolysis, xviii. 299 ; 
peptonization, xviii. 301 ; protease, nature 
of, xviii. 314; proteolytic action, xvi. 13. 
Yeast-cell, structure, xii. 515, 567. 
Yeast-plant, budding (*), xii. 530; glycogen 
vacuoles (*), xii. 527; nuclear apparatus 
(*), xii. 516 ; nucleus (*), xii. 499 ; spore- 
formation (*), xii. 532 ; structure (*), xii. 
515; vacuole, origin (*), xii. 526. See 
also Saccharomyces. 
Yucca aloifolia, seedling-structure, xvii. 35, 
39 * 
Yucca arborescens, seedling-structure, xvii. 
35 - 
— gloriosa, seedling-structure, xvii. 36, 39. 
Z. 
Zamia Fischeri, structure of sporophyll, xii. 
230. 
— furfuracea, structure of sporophyll, xii. 
229. 
— latifolia, structure of sporophyll, xii. 225. 
— Leiboldii, structure of sporophyll (*), xii. 
230. 
— Lindeni, structure of sporophyll (*), xii. 
227. 
— Loddigesii, structure of peduncle (*), xi. 
41 1 ; of sporophyll (*), xii. 228. 
— muricata, structure of sporophyll, xii. 
227. 
— pumila, structure of sporophyll, xii. 226. 
— Skinneri, structure of sporophyll, xii. 226. 
Zea Mais, embryo, morphology (*), xix. 1 15 ; 
enzyme-secreting cells in seedling (*),. 
xviii. 267; proteases of seeds* xx. 116, 
1 1 8 ; scutellum, structure (*),xix. 117. 
Zoospore-formation in Oedogonium, abnor- 
mal, xvi. 481. 
— germination in Aglaonema (*), xii. 87 ; 
in Oedogonium (*), xvi. 412. 
Zygadenus elegans, seedling-structure (*), 
xvii. 32. 
Zygnemaceae, structure, &c. (*}, xii. 37, 40.. 
Zymogen in glands of Nepenthes, xii. 550. 
