764 
Hydrangea, 264, 531 
arborescens, 531 
Hydrastis, 260, 518 
Hydrastis canadensis, 518 
Fig. of, 517 
Fig. of colony of, 620 
Hydrochloric acid, 684 
Hyoscyamus U.S. P., 598 
fruit of, 301 
Hyoscyamus muticus, 126, 126 
niger, 598 
Fig. of calyx, 266 
Hypericacea, 564 
Hypericum, 276, 565 
perforatum, 564, 565 
Hypha, defined, 362 
Hyphe, aerial, 377, 389 
rhizoidal, 377 
stoloniferous, 377 
submerged, 377, 389 
Hyphomycetes, 333, 362 
Hypocotyl, 311 
Hypocreacea, 395 
Hyssopus, 596 
Hyssopus officinalis, 596 
Iceland Moss, 414 
Ignatia, 585 
Imperatoria, 477 
Imperatoria Ostruthium, 477 
Inclusions, 74 
INDEX 
~ Todine, a source of, 354 
Indchiscent fruit, 298, 300 
Indeterminate inflorescence, 256 
Indian Corn, 315, 397 
Figs. of grain and seedling, 316, 317 
histology of seed, 315 
Indian Cress, 267 
Indigo, 540 
Indigofera tinctoria, 540 
Indirect nuclear division, 47 
Indusium, 67, 433 
Ingestion, 26 
Inheritance, 643, 652 
Integuments of angiospermous ovule, 
287 
Intercellular-air-spaces, lysigenous, 147 
147 
Internal phloem, 204 
Internal secretion reservoirs, 148 
Internode, defined, 186 
Intine, 282, 292 
Intussusception, 27, 31, 108 
Inula, 615 
Inula Helenium, 615 
Inulase, 103 
Inulin, 82 
Invertase, 75, 102 
Involucre, 256 
Involucres, persistent, 297 
