Index to Vo Is. XX1-XXX. 
17 
Hordeum vulgare, seedling-anatomy (*), 29 , 
203. 
Hormodendron, disease caused by (*), 24 , 
359; origin of Cladosporium from, 24 , 363 ; 
production of, from Cladosporium, 24 , 
363. 
— and Cladosporium, relationship, 24 , 367. 
Hormones, function of, in regulating meta- 
bolism, 25 , 507. 
Horne, A. S. : Discharge of Antherozoids in 
Fossombronia and Haplomit.rium Hookeri 
(*), 23, 159. 
— Preliminary Note on Spongospora Solani, 
Brunch., 25 , 272. 
Host and parasite, relationship, 25 , 653, 
661 (*). 
- — tissue and infection drop, relationship, 
30 , 399. 
Hottonia, anatomy (*), 25 , 255 ; morpho- 
logy and life-history (*), 25 , 253 ; seedling- 
anatomy '(*), 25 , 262. 
Humaria granulata, cytology of ascus (*), 
23,538. 
— rutilans, cytology, 21, 307 ; ascocarp 
development (*), 22, 35 ; ascus formation 
(*), 22, 36 ; meiotic phase (*), 22, 37 ; 
mitosis (*), 22, 39 ; nuclear association, 
22, 51 ; spore-formation (*), 22, 51. 
Hume, E. M. M. : The Histology of the 
Sieve-tubes of Pteridium aquilinum, with 
some Notes on Marsilia quadrifolia and 
Lygodium dichotomum (*), 26 , 573. 
Hunter, C. : The Aerating System of 
Vicia Faba (*), 29 , 627. 
Hyacinthus candicans, question of hetero- 
typical reduction in somatic cells (*), 24 , 
781. 
Hyalotheca dissiliens, nuclear division (*), 
30 , 379. 
Hybrid ferns, cytology (*), 24 , 191. 
Hydnobolites, description, 23 , 253. 
— cerebriformis, description (*), 23 , 253. 
Hydnotrya, description, 23 , 254. 
— Tulasnei, description (*), 23 , 254. 
Hydrastis canadensis, vascular anatomy (*), 
22,675. 
Hydrochloric acid as a poison, reaction 
velocity, 23 , 182. 
Hydrogen ion, effect of temperature on the 
permeability of plant cells to (*), 29 , 61 1. 
Hydrotropism in roots of Lupinus albus, 29 , 
265. 
Hypericum pulchrum, insect visitors, 22, 634. 
Hypoderris, phyletic consideration (*), 26 , 
308. 
I. 
Iberis, spp., seedling-anatomy (*), 28 , 717. 
— amara, insect visitors, 22, 620. 
Ibervillea sonorae, water-balance (*), 26 , 81. 
Idioplasmic theory of heredity, 22 , 550. 
Illicium floridanum, vascular anatomy (*), 
22, 667. 
Illicium religiosum, seedling-anatomy, 28 , 
710. 
Incarvillea Delayvei, seedling-anatomy (*), 
26 , 74°- 
Indigofera arrecta, cause of hardness in seed 
(*), 21 , 57 . 
Infection by Botrytis cinerea (*), 30 , 389. 
‘Infection drop’ and underlying tissue of 
host, relationship, 30 , 399 ; presence of 
oxalate in, 30 , 405 ; presence of toxin in, 
30 , 404. 
Insect pests of Coniferae, 24 , 267. 
Insects and flowers in Great Britain, 22 , 
603. 
Integument in Trigonocarpeae and Lageno- 
stomales, origin, 28 , 73. 
Intraxylary phloem in stems of Dicotyledons, 
origin and meaning (*), 29 , 567. 
Inula Helenium, seedling-structure, 28 , 308. 
Ion-action, exosmosis of electrolytes as a 
criterion of antagonistic (*), 29 , 349. 
Ipomoea, spore development (*), 25 , 200. 
Iron in Saccharomyces (*), 24 , 69. 
Irving, A. A. : The Beginning of Photo- 
synthesis and the Development of Chloro- 
phyll (*), 24 , 805. 
— The Effect of Chloroform upon Respira- 
tion and Assimilation (*), 25 , 1077. 
— see Priestley, J. H. 
Isolation and Natural Selection, 25 , 743. 
Isomers, toxic action of, on vegetable cells, 
23 , 181. 
J. 
Jasminum nudiflorum, distribution of chloro- 
phyll in young shoots (*), 21, 437. 
Java, Anthocerotaceae of (*), 21 , 467 ; 22 
9 i, 33 °- 
Jeffrey, E. C.: On the Affinities of the 
Genus Yezonia (*), 24 , 767. 
— On the Structure of the Leaf in Creta- 
ceous Pines (*), 22 , 207. 
— Traumatic Ray-Tracheides in Cunning- 
hamia sinensis (*), 22, 593. 
— and Cole, R. D. : Experimental Inves- 
tigations on the Genus Drimys (*), 30 , 
359 - 
Jesson, E. M. : On the Hairs of the To- 
mentum and Ovary in Rhododendron 
Falconeri, Hook, f., and Rhododendron 
Hodgsoni, Hook. f. (*), 29 . 635. „ 
Johnson, J. C. : On well-marked Aerotropic 
Growths of Bacillus megatherium, 26 , 
949- 
Jorgensen, I. : see Stiles, W. 
Juglans, spp., anatomy of leaf-fail, 25 , 92; 
seedling-structure (*), 30 , 583. 
— regia, anatomy of leaf-fail, 25 , 93 ; mor- 
phology of ovule and female flower (*), 23 , 
623 ; gynoecium (*), 23 , 625 ; ovule, 23 , 
628; seedling-structure, 30 , 585. 
Julianiaceae, relationship (*), 23 , 336. 
Juncaceae, parasitic root disease (*), 24 , 
