138 



Index. 



Root pressure, 57-61 



Root, structure of, 51 



Russian thistle (see Salsola), 65, 66 



Salix, 79 



Salsola (see Russian tliistle), 65, 66 



SaTnbuctis, 55, 76, 78, 79 



Schizaa pusilla, 39, 68, 75 



Secretion, log, no 



Scutellum, 40, 41 



Sedum, 66 



Sensory organization, 112, 113 



Skunk cabbage (see Spathyemd), 45 



Smilax^ 24 



Smilax, 66, 67 



Sodium cliloride, effect upon germi. 



nation, 35, 36 

 Soja beans, 62 



Spathyema (see Skunk cabbage), 45 

 Spirogyra ^ 30, 32, 53 

 Spores, germination of, 39, 40 

 Spring Beauty (see Claytonia), I2g 



131 

 Squash (see Cuctirbitd), 23, 25, 26, 



37, 43, 44, 126, 127 

 Starch, formation of, 94, 95 



test for, 94, 95 

 Stele, 17, 18 



Stem, structure of, 11-15 

 Stimulation, 112-134 

 Stimulus, no 

 Stipa avicenncB^ 63 

 Sunflower (see Helianthus), 9, 23, 



55, 56, 58, 64, 86, 87, 116 

 Sweet potato (see Ipomea), 45 

 Symbiosis, 96, 97 

 Syringa, 79 



Taraxacum (see dandelion), 23, 55 

 Temperature, relation to growth, 



28-30 

 scale of, 4 

 Tendrils, 126, 127 

 Thistle, 36 

 Tissa rubra^ 66 

 Tissue tensions, 53-55 

 Tomato, 43, 75 

 Tradescantia^ 27, 75, II9 

 Translocation, 107, 108 

 Transpiration, 68 

 Trifoliam (see Clover), 43, 65 

 Triiiciim, 15, 28, 72 

 Tubercles, 97, 98, 99 

 Tulip, 24 



Turgidity, 52, 53, 54 

 Tussilago, 129 



Urtica (see Nettle), no, in 

 Viola tricolor (see Pansy), 109, no 

 Vitis (see Grape), 58 

 Wandering jew (see Tradescantia), 



ng 

 Water crowfoot (see Ranunculus), 



123 

 Water cultures, 84-87 

 Water marigold (see Bidens Beckii), 



123 

 West Indian filbert (see Entada 



scandens), 127 

 Wheat (see Triticum), 15, 28, 72, 



102, 103 

 Wilting, 55, 56 

 Yams, 45 

 Zea (see Corn), 15, 16, 28, 34, 40, 



41, 72, 75 



