Index, 



Root pressure, 57-61 



Root, structure of, 51 



Russian thistle (see Salsola), 65, 66 



Salix, 79 



Salsola (see Russian thistle), 65, 66 



Sambucus, 55, 76, 78, 79 



Schizaa pusilla, 39, 68, 75 



Secretion, 109, no 



Scutellum, 40, 41 



Sedtim, 66 



Sensory organization, 112, 113 



Skunk cabbage (see Spathyemd), 45 



Smilax, 24 



Smilax, 66, 67 



Sodium chloride, 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), 129 



131 

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



37, 43, 44, 126, 127 

 Starch, formation of, 94, 95 



test for, 94, 95 

 Stele, 17, 1 8 ' 

 Stem, structure of, 11-15 

 Stimulation, 112-134 

 Stimulus, no 

 Stipa avicenmz, 63 

 Sunflower (see Helianthus), 9, 23, 



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

 Sweet potato (see Ipomed), 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 

 Tretdescantia, 27, 75, 119 

 Translocation, 107, 108 

 Transpiration, 68 

 Tri folium (see Clover), 43, 65 

 Triticum, 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 Trade scantia), 



119 

 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, 



4i, 72, 75 



