GENERAL INDEX 



237 



Sandwort, 31, 129, 130. 



thyme-leaved, 85, 156, 168, 174, 208. 

 Scabiosa arvensis. See Scabious. 



S. sttccisa, 222. 



Scabious, 124, 148, 158, 171, 179, 222. 



Scale leaves, 32. 



Scandix pecten. See Shepherd's 



Needle. 



Scarce weeds, 122. 

 Scleranthiis annum. See Annual 



Knawel. 



Scour, 107, 193. 

 Scrambling weeds, 89. 

 Sedge, 178, 179, 190, 210. 

 Seed production, abundant, 18, 77, 84. 



Testing Station, 44. 

 Seedlings, destruction of, 3. 



" Seeds" crops, 6, 132, 161-74. 



Selfheal, 129, 181, 220. 



Senebiera coronopus. See Swine-cress. 



Senecio jacobcea. See Ragwort. 



S. vulgaris. See Groundsel. 



Serradella, 55, 58. 



Serratula tinctoria, 223. 



Sexual reproduction, 18. 



Sheep, 107, 108, no, in, 116, 186, 

 187-205. 



Sheep's sorrel, 4, 18, 28, 36, 44, 49, 62, 

 68, 69, 74, 104, in, 118, 119, 120, 

 141, 143, 144 (fig.), 151, 153, 154, 

 158, 162, 163, 174, 179, 223. 



Shepherd's needle, 25, 28 (fig.), 50, 

 87, 126, 127, 153, 155, 158, 165, 

 173, 223. 



purse, 4, 16, 17, 20^ 85, 88, no, 



112, 126, 127, 156, 162, 163, 164, 



183, 210. 



Sheradia arvensis. See Field Madder. 

 Silage crops, 50. 

 Silene anglica, 223. 

 S. inflata. See Bladder Campion. 

 S. noctiflora, 223. 



Silverweed, 16, 38, 88, 104, 126, 128, 

 151, 158, 171, 179, 183, 184 (fig.), 197, 



220. 



Sisymbriiim officinale, 129, 223. 

 Smother crops, 50, 51, 159, 166, 170. 

 Sodium arsenite, 59, 67, 96. 

 bisulphate, 60. 



nitrate, 96. 



Soils, classification, 122. 



Solamtm dulcamara, 31, 223. 



S. nigrum, 31, 95, in, 224. 



Somme battlefield, 76. 



Sonchus arvensis. See Corn Sow- 

 thistle. 



S. oleraceus. See Sowthistle. 



Sorrel, 21, 36 (fig.), 38, 68, 104, 118, 

 119, 178, 179, 182, 185, 186, 188, 199, 

 222. See also Rumex acetosa. 



Sour land, 141. 



Sowthistle, 23, 62, 70, 95, 201, 224. 



corn, 9, 18, 33 (fig.), 36, 48, 136, 



I 5 I I5 8 162, 163, 164, 224. 

 Speedwell, 19, 31, 62, 87. 



field, 16, 17, 81, 82, 122, 126, 127, 



139, 158, 162, 163, 164, 173, 225. 



germander, 181, 225. 



ivy-leaved, 82, 85, 131, 158, 169, 



225. 



large field, 136, 139, 158, 169, 170, 



225. 



thyme-leaved, 150, 158, 183, 225. 



wall, 131, 158, 168, 172, 174, 225. 

 Spergula arvensis, 154. See also 



Spurry. 



Spiraafilipendula, 224. 

 S. nlmaria. See Meadowsweet. 

 " Splits," 125. 

 Spraying, time of, 56. 

 Sprays, 9, 54, 55, 59, 66, 67, 96. 

 Spurge, 20, 85, 87, 104, in, 213. 



dwarf, 16, 136, 138, 156, 165, 213. 



See also Euphorbia exigua. 



petty, 126, 128, 156, 213. 



sun, 129, 130, 156, 171, 174, 187, 



213. 

 Spurry, 4, 16, 19, 21, 22 (fig.), 31, 56, 



62, 85, 87, 117, I2O, 123, 141, 142 



(fig-). 151, 153, 158, 160, 169, 170, 

 173, 174, 201, 224. See also Spergula 

 arvensis. 



Stachys arvensis, in, 224. 



S. betonica, 224. 



S. palustris, 224. 



Stagger weed, in. 



Star-of-Bethlehem, spiked, 38, 196. 

 See also Ornithogalum pyrenaicum. 



Stellaria graminea, 224. 



S. media, 130, 19 1. See also Chick- 

 weed. 



Stinkweed, 115. See also Thlaspi 

 arvense. 



Stitchwort, 187. 



Stork's-bill, 20, 213. 



Storm columns, weeds distributed by, 



17- 



Struggle for existence, 120. 

 Stia-da fniticosa, nS. 

 S. maritima, 118. 

 Sub-dominant weeds, 122. 

 Sulphate, ammonium, 69. 

 - copper, 55, 56, 57, 59, 67. 



iron, 55, 57, 58, 59, 61, 67, 96. 



nickel, 59, 60. 

 Sulphuric acid, 55, 58, 60, 67. 

 Superphosphate, 69. 

 Survey, weed, 121. 



Swine-cress, 16, 87, 136, 137, 158, 183, 

 223. 



