LIST OF PLANTS USED FOB STUDY. 467 



Hordeum vulgare (Barley). Structure of growing apex of root, 220. Roots 

 of plants grown in flower-pots. 



Horse-chestnut. See Msculus. 



Hyacinth. See Hyadnihus. . 



Hyacinthus. Structure of ovary, 396. Full-open flowers. Fresh. (As 

 substitutes, see Tulipa, Lilium, or other Liliaceae.) 

 Development of pollen, 385. (Substitute for Hemerocallis, q.v.) 



Also used for structure of stomata, 84 ; and for stele of root, 165. 

 Hydrocharis Morsus-Rancc (Frog-bit). Movement of protoplasm in root- 

 hairs, 47. Young roots. Quite fresh. A native aquatic, with 

 floating rosettes of heart-shaped leaves ; easily grown in still water. 



I. 



Impatiens parviflora. For vascular bundle ends, 200. Leaves, in alcohol. 



Indian corn. See Zea Mais. 



India-rubber plant. See Ficus elastica. 



Iris florentina. Structure of leaf, 80. Leaves. Fres.h, and in alcohol. 



Wax, 80, 99. Leaves. Fresh. 



Endodermis of root, 166. Roots. In alcohol. 



Vascular bundle, 114. Leaves. In alcohol. 



germanica. Starch-builders (leucoplasts) and starch, 59. Surface 



rhizomes. Fresh. Both species are hardy, herbaceous, more or less 

 evergreen. 



Any species, used as substitute for Hemerocallis in development 

 of pollen, 385. 

 Ivy. See Hedera Helix. 



J. 



Juglans regia (Walnut). Leaf-fall, 203. Leafy twigs. Fresh. See also as 

 in sEsculus. 



Laburnum. See Cytisus Laburnum. 



Larkspur. See Delphinium. 



Lathyrus (Sweet Pea, Everlasting Pea). Formation of pollen-tube, 392. 

 Freshly opened flowers. 



Lemna (Duckweed). For general structure of root, 219. Fresh. 



Lepidium sativum (Cress). Used as host-plant for Pythium, 321. Seedlings 

 grown crowded together and kept very wet. 



Leptothrix buccalis, 276. In the " fur " on teeth. 



Ltucojum (Snowflake). Development of pollen-grains of, 386. Flower- 

 buds of different ages. Fresh, and in alcohol. (As substitute for 

 Tradescantia, q.v.} Also for development of pollen-tubes, 392. 



Lilium (Lily). Used as Leucojum above, 385. 



Structure of ovary, 396. Fully developed flowers. Fresh. Struc- 

 ture of ovule, 405. 



