INDEX TO VOLUME VIII 
Hackberries, 198 
Haenseler, cm. The effect of salt pro- 
portions and concentration on the growth 
of Aspergillus niger, 147 
Halophila, pollen of, 473 
Hanson, Herbert C. Distribution of the 
Malvaceae in southern and western 
Texas, 192 
Harris, J. Arthur, Edmund W. Sinnott, 
John Y. Pennypacker, and G. B. 
Durham. The vascular anatomy of di- 
merous and trimerous seedlings of Phase- 
olus vulgaris, 63; correlations between 
anatomical characters in the seedling of 
Phaseolus vulgaris, 339; the vascular 
anatomy of hemitrimerous seedlings of 
Phaseolus vulgaris, 375; the interrelation- 
ship of the ijumber of the two types of 
vascular bundles in the transition zone of 
the axis of Phaseolus vulgaris, 425 
Hazel, pollen tubes of, 474 
Hedera trifolia Canadensis, 127 
Helleborus, pollen of, 472 
Hemitrimerous seedlings of Phaseolus vul- 
garis, vascular anatomy of, 375 
Hemp, Mauritius, 219 
Hibiscus cardiophyllus, 195; coccineus, 202; 
couUeri, igy ; denudatus var. involucellatus, 
199; esculentus, 202; lasiocarpus, 194; 
manihot, 202; niilitaris, 194; rosa-sinensis, 
202 ; sabdariffa, 202 ; syriacus, 202 ; trionum, 
202 
Hickory, pollen tubes of, 474 
Hicoria, 194 
Hitchcock, A. S. The type concept in 
systematic botany, 251 
Hoerner, G. R. Miscellaneous studies on 
the crown rust of oats, 452 
Holcus lanatus, 253; spicatus, 44 
Hordeum, 255; vulgare, 255 
Horse chestnut, pollen of, 480 
Huisache, 194 
Humulus Lupulus, 396 
Hyacinth, pollen of, 471 
Hydration, water deficit and the action of 
vitamines, amino-compounds, and salts 
on, 296 
Hymenophyllaceae, 313 
Hypericum, stylar canal of, 475 
Ilex, 194 
Indian corn, roots of, 210 
Ipomoea, pollen of, 472 
Ipo toxicaria, 238 
Iresine, 33, 37, 166, 168; Herbstii, 164 
Iris, stylar canal of, 475; pumila, 31; versi- 
color, pollen tubes of, 474 
Isoachlya, a new genus of the Saprolegnia- 
ceae, 231; monilifera, 231; paradoxa, 231; 
toruloides, 231 
Johnson grass, 44 
Juglandaceae, 330 
Juglans regia, ovule of, 403 
Juniperus, 199; pollen of, 479 
Kauffman, C. H. Isoachlya, a new genus 
of the Saprolegniaceae, 231 
Knudson, L., and S. Ginsburg. Sugges- 
tions with respect to the measurement of 
osmotic pressure, 164 
Kosteletzkya aUhaeifolia, 194 
Kuehneola, 450; aliena, 450; Butleri, 450 
Labiatae, 330 
Laminaria, 367, 382; Agardhii, 465 
Lamium amplexicaule , pollen tubes of, 477 
Laportea canadensis , 398 
Lathyrus, pollen of, 472 
Leguminosae, 66; food plants of, 329 
Leontodon Taraxacum, 283 
Leptosporangiatae, 313 
Leucophyllum texanum, 194 
Levine, Michael. Studies on plant can- 
cers HI. The nature of the soil as a 
determining factor in the health of the 
beet. Beta vulgaris, and its relation to 
the size and weight of the crown gall 
produced by inoculation with Bacterium 
tumefaciens, 507 
Liliaceae, food plants of, 329 
Lilium pardalinum, pollen of, 472; rubrum, 
pollen of, 483 
Lily, stylar canal of, 475; pollen of, 477 
Liguidambar styraciflua, 194 
Liriodendron, Aspergillus cultures on bark 
of, 113 
Loganiaceae, 331 
Lupine, 27; pollen of, 472 
Lychnis, pollen of, 472 
Lycopods, 314 
Lygodium, 313; articulatum, 312 
Lyon, C. J. Comparative studies on respi- 
ration XVIII. Respiration and antag- 
onism in Elodea, 458 
Ly thrum salicaria, pollen of, 479 
