GENERAL INDEX. 



Achillea millefoliiim. See Yarrow. 



Acid soil, 118, 119, 120, 141, 151. 



Adventitious roots, 88. 



jEthusa cynapium, 73, 106, 128, 206. 



Agrimonia eupatoria, 26 (fig.), 188, 

 189, 206. 



Agrimony, 25, 26 (fig.), 116, 188, 189, 

 206. 



Agropyron repens. See Couch-grass. 



Agrostis. See Bent-grass. 



A. alba, 190, 206. 



A. stolonifera, 38, 151, 206. 



A. vulgaris, 206. 



Aira c&spitosa, 112, 178, 206. 



A. caryophyllea, 206. 



Ajuga reptans, 207. 



Alcliemilla arvensis. See Lady's 

 Mantle. 



A. vulgaris, 178, 207. 



Alfalfa, 59, 96. See also Lucerne. 



A Ilium ursinum. See Ramsons. 



A. vineale. See Crow Garlic and Wild 

 Onion. 



Alluvial areas i?7- 



Alopecurtis agrestis, 154. See also 

 Black Bent. 



A. geniculatus, 207. 



A. pratensis, 27, 75. 



America, 97, 115. 



American Weeder, 47. 



Ammonium sulphate, 69. 



Anagallis arvensis. See Scarlet Pim- 

 pernel. 



Animals, weeds distributed by, 23, 74, 



75- 



Annual weeds, 46, 58, 84. 

 Anthemis arvensis. See Corn Chamo- 



mile. 



A. cotula, 134, 156, 207. 

 Anthoxanthum odoratum, 182. 

 Anthriscus sylrestris. See Wild 



Chervil. 



Anthyllis vulneraria, 187, 208. 

 Antirrhinum orontium, 208. 

 Arabis thaliana, 129, 208. 

 Arable land, eradication of weeds from, 



46-63. 



weeds, definition of, 2. 

 in grass fields, 16. 



Arctium lappa, 73. 



Arenaria serpyllifolia. See Sandwort. 

 Arnoseris pusilla, 208. 

 Arrhenatherum avenaceum, 27, 208. 

 A. avenaceum var. tuberosum, 39, 41 



(fig.). 



Arrowhead, 178. 

 Arsenite of soda, 59, 67, 96. 

 Artemesia vulgaris, 208. 

 Asparagus, Bath, 91, 196. See also 



Ornithogalitm pyrenaicum. 

 Assimilation of carbon-dioxide, 5. 

 Association of weeds with all crops, 

 162-4. 



cereals, 172-4. 



peas and beans, 162, 170, 



171. 



root crops, 162, 164. 



"seeds," 162, 166-8. 



Aster tripolittm, 118. 

 Atriplex patula. See Orache. 

 Australia, 4, n, 43, 59, no. 

 Avenafatua. See Wild Oat. 

 A.Jlavescens, 27. 

 A. strigosa, 12. 

 Avens, 26, 194. 

 Awn, hygroscopic, 25, 188. 



BALLAST, weeds distributed by, 10, 12. 

 Barberry, 70. 



Barley, 5, 6, 7, 51, 57, 59, 99, 101 (fig.), 

 115, 161-74. 



meadow, 178. 



wall, 27. 



wild, 112. 



Barn field, Rothamsted, 9. 



Bartsia odon tiles. See Red Bartsia. 



Bartsia, red, 91, 93, 102 (tig.), 148, 149, 



150, 156, 165, 174. 

 Basic slag, 69, 99. 

 Bastard-alkanet, 195. 

 Battlefield, Somme, 76. 

 Beans, 58, 161-74. 

 Bedstraw, 94. 



ladies'. See Galium verum. 



marsh, 178. 

 Belgium, 112. 



Bellis perennis. See Daisy. 



229 



