INDEX 



445 



Nitrates, retention of, in soil by I 



weeds, 2 



Nitrogen in pastures, 143 

 Nitrogenous manures favour weeds, 



42 



Nuphar luteum, 325, 386 

 NymphceacecB, 325, 386 

 Nymphcea alba, 326, 386 



OAK, 313, 403 



Oat Grass, Bulbous, 131 



Downy, 39, 145, 47 



False, 147 



Narrow-leaved, 407 



Wild, 128, 233, 407 



Yellow, 39 

 Oats, blindness of, 1 2 



Bristle-pointed, 129 



Wild, 233 



CEnanthe crocata, 296, 392 

 OZnanthin, 298 



Oil of Euphorbia, 309, 311 



Old Man's Beard, 151, 384 



Onagracece, 166, 391 



" Onion " Couch, 407 



Onion, Wild, 40, 44, 125, 209, 404 



Ononis repens, 163 



spinosa, 163, 389 



Onopordon Acanthium, u, 182, 394 ' 

 Ophioglossum vulgat^lm, 408 

 Orache, Halberd-leaved, 122,401 



Spreading, 122, 401 



Orange Hawkweed, 194, 396 

 Orchards, weeds in, 136 

 Orchidacece, 208, 403 

 Orchis macuZata, 208, 403 

 mascula, 208, 403 



Purple, 208, 403 



Spotted, 208, 403 



Orobanchacecs , 263, 399 

 Orobanche, 263, 399 



minor, 264, 399 

 ramosa, 264 



Rapum-genistcB, 264 

 Oscinis frit, 1 1 



Oxalis Ascetosella, 389 



Ox-eye Daisy, 24, 28, 40, 186, 234, 



395 

 Yellow, 92 



PADDOCK-PIPES, 228, 408 

 Papaver Argemone, 53 



dubium, 24, 53, 369, 385 



hybridum, 53 



Papaver Rhceas, 24, 53, 281, 369, 385 



somniferum, 53, 281 



Papaver ace CB, 53, 281, 385 

 Paper, tarred, use of, 41 

 Paradin, 317 

 Parasitic weeds, 12, 256 

 Paris quadrifolia, 3 1 7, 404 

 Parsley, Common Beaked, 39, 147, 

 392 



Cow, 234 



Fool's, 24, 83, 298, 392 



Hedge, 82, 392 



Upright Hedge, 171 

 Parsley Piert, 80, 390 

 Parti-coloured Scorpion Grass, 107 

 Pasque Flower, 384 



Pastures, experiments on, 141 



nitrogen in, 143 



Paths, weeds in, 349 

 Pearl-grass, 131 

 Peas, 48 

 Pedicularis, 13 



palustris, 272, 323, 399 



sylvatica, 272 



Pegomyia beta, 1 1 

 Pepperwort, 66, 233, 387 

 Field, 65, 387 



Penny Cress, 40, 66, 387 

 Perennial Ryegrass, 39 



Sow Thistle, 47, 101, 396 



Perennials, 18, 35 

 Periderniium pini, 12 

 Peronospora effusa, 12 



parasitica, 1 1 



Persicaria, 7, 8, 27, 47, 114, 401 



Petasites vulgaris, 1 79, 394 



Pdroselinum, 234 



Petty Spurge, 124, 402 



Phaseolunatin, 291 



Phaseolus lunatus, 290, 390 



Phorbia brassicce, 1 1 



Phosphates, influence on grass, 143 



Phosphoric acid, 145 



Phragmites coinmunis, 323, 339, 407 



Phyttotreta (Haltica) nemorum, 1 1 



Pictou Cattle Disease caused by 



Ragwort, 187 

 Pig-nut, 234, 391 

 Pig- weed, 119 

 Pilewort, 152, 385 

 Pimpernel, Scarlet, 6, 113, 400 

 Pine Cluster-cups, 12 

 Plankton, 323 

 Plantaginece, 108, 196, 398 



