Index to Vo/s. XI-XX. 
Dicotyledons and Monocotyledons, compar- 
ative antiquity of, xvii. 68 ; origin, xix. 457. 
— embryology of some anomalous (*), xix. 
447 ; infranodal organs in (*), xv. 135; 
nature of vascular system of stem of cer- 
tain, xvi. 599. 
Dictyostele, definition, xvi. 523. 
Dictyotaceae, gametophyte generation (*), 
xviii. 183; antheridium development (*), 
xviii. 187 ; antherozoids (*), xi. 183; cy- 
tology (*), xviii. 183, 545 ; fertilization (*), 
xviii. 19 1 ; oogonium development (*), 
xviii. 184 ; parthenogenesis (*), xviii. 196 ; 
segmentation (*), xviii. 194; sexual cells, 
periodicity (*), xix. 531. 
— tetrasporangium : — alternation of gen- 
erations, xviii. 155; nucleolus, xviii. 
156; stalk - cell - division (*), xviii. 142; 
tetraspore, karyokinesis in germinating 
(*), xviii. 153; tetraspore mother-cell, 
reducing-division (*), xviii. 145; tetra- 
spore mother-cell, second mitosis (*), 
xviii. 152. 
Dictyotadichotoma, cell-plate formation (*), 
xiv. 179; chromosomes (*), xiv. 185; 
cytoplasm (*), xiv. 166 ; karyokinesis (*), 
xiv. 169 ; nuclear and cell-division (*), xiv. 
163 ; nucleus, xiv. 168 ; reproduction, xii. 
559 ; sexual cells, periodicity (*), xix. 531. 
— is the periodicity in an hereditary char- 
acter? xix. 546. 
Dieffenbachia Seguine, flower development 
(*), xiv. 4 ; male flowers (*), xiv. 5 ; ovule 
(*), xiv. 6. 
Diffusion of gases and liquids in relation to 
carbon-assimilation and translocation, 
static, xiv. 537. 
Digestion by leaves, xix. 157 ; Asparagus 
officinalis, xix. 160; Cucurbita Pepo var. 
ovifera, xix. 160; Ficus Carica, xix. 159; 
Phytolacca decandra, xix. 159 ; Rheum 
officinale and undulatum, xix. 158. 
— of endosperm of Phoenix dactylifera, in- 
capacity for self-, xx. 61. 
Dimorphism of Cutleria, seasonal (*), xii. 92. 
Dioon edule, structure of sporophyll (*), 
xii. 221. 
Dioscorea prehensilis, spinous roots ; mor- 
phology (*), xi. 327 ; structure (*), xvii. 
413. 
— sativa, origin, development, and morpho- 
logical nature of aerial tubers (*), xv. 491. 
Dipcadiserotinum, seedling-structure, xvii. 12. 
Diplodia cacaoicola a parasitic fungus on 
Sugar-cane and Cacao in the West Indies 
(*), xv. 683 ; systematic position, xv. 698. 
Dipsaceae, insects and flowers, xvii. 319. 
Dischidia rafflesiana, evolution of pitchers 
(*), xvi. 365. 
— Shelfordii, n. sp., description, xvii. 617. 
Dispersal of Mangrove seedlings (*), xvii. 
267 ; of seeds by wind, x'x. 35 t. 
Dissemination of Arceuthobium occidentale 
I I 
(*), xix. 100; of spores of Pythium ulti- 
mum, xv. 285. 
Dissociation theory and chemotaxis, xiv. 562. 
Distribution of spores of Uredineae, xix. 11. 
Dixon, H. H. — Gelatin as a Fixative, xii. 
117. 
— Resistance of Seeds to High Tempera- 
tures, xvi. 590. 
— The Possible Function of the Nucleolus 
in Heredity, xiii. 269. 
— The Tensile Strength of Cell-walls, xi. 
585. 
— The Structure of Codium (one -wood- 
cut), xi. 588. 
Doodia aspera, seedling-structure (*), xix. 
366. 
Dorsiventrality of the Podostemaceae with 
reference to current views on Evolution, 
xvi. 593. 
Doryanthes excelsa, seedling-structure, xvii. 
42. 
— Palmeri, seedling-structure, xvii. 42. 
Dracaena Draco, seedling-structure, xvii. 
36. 
Droppers, morphology and structure of 
Erythronium (*), xx. 436; of Tulip (*), 
xx. 431. 
Drosera, changes in the gland-cells produced 
by various food-materials, xii. 560. 
E. 
Echinocactus, morphology of embryo and 
seedling (*), xii. 454. 
Echinocereus, morphology of embryo and 
seedling (*), xii. 450. 
Echinopsis, morphology of embryo and 
seedling (*), xii. 451. 
Elaphomyces and Cordyceps, connexion 
between, xv. 525. 
— variegatus, mycorhiza of (*), xv. 526. 
Electrical method for estimation of seed- 
vitality, xv. 427. 
Elettaria cardamomum, seedling structure, 
xvii. 50. 
Ellis, D. — The Life-history of Bacillus 
hirtus (Plate XVI), xx. 233. 
Ellis, W. G. P. — A Method of obtaining 
Material for illustrating Smut in Barley, 
xii. 566. 
— Fungi for Class-demonstration, xi. 333. 
Elvella , description, xi. 253, 286. 
— clavata , description (*), xi. 255. 
— cucullata, description (*), xi. 276. 
— lubr'tca , description (*), xi. 288. 
Embryo of Anthurium violaceum var. leuco- 
carpum (*), xix. 334 ; 
— of Cactaceae, colour-factors, xii. 434 ; 
form-factors (*), xii. 438 ; morphology, 
comparative (*), xii. 423 ; size-factors (*) 
xii. 436. 
— of Cryptomeria japonica (*), xviii. 417; 
of Nephthytis liberica,xix. 343; of Ophio- 
glossum pendulum (*), xvi. 31 ; of Pepe- 
