INDEX 



327 



Polyporus sulphureus, 42, 52, 53, 

 200 



vaporarius, 42, 198, 199, 213 

 Polystigma fulvum, 98 

 ochraceum, 98 

 rubrum, 97 

 Poplar, see also Populus 



Lombardy , D idy mosphaeria on , 1 04 

 Populus, Dodder on, 34 



Erysiphe adunca on, 70 

 alba, Exoascus aureus on, 135 

 nigra, 135 



tremula, 135 



Potato disease, 64 



Potatoes, Dematophora necatrix on, 

 82 



Engrafting, 267 

 Reserve materials in, 40 

 Resistance of, to disease, 12 

 Pourridie" de la Vigne, 82 

 Pourriture, 82 

 Predisposition to disease, 8 

 Abnormal, 9,* 1 5 

 Climatic, 10 

 Individual, 12, 13 

 Induced by hail, 1 5 



conditions of growth, 14 

 insects, 15 

 soil, 10 

 Local, 9 

 Normal, 9 

 Seasonal, n 

 Temporary, 10 

 to frost, 14 



Pressler's growth-borer, 18 

 Preventitious buds, 238 

 Preventive measures against parasites, 



54 



Progress, Organic, depends on varia- 

 tion, 5 



Promycelium of smut-spores, 66 

 Pruning, 249 



of roots, 264 



Prunus, Polystigma rubrum on, 97 

 avium, Agaricus on, 207 

 Exoascus deformans on, 132 

 Polystigma ochraceum, 98 

 Cerasus, E. deformans on, 132 

 Chamaecerasus, 132 



domestica, Agaricus on, 207 

 Exoascus deformans on, 132 



Pruni on, 131 



instititia, Exoascus on, 133 

 Padus, Pruni on, 131 



Melampsora on, 171 

 Nectria ditissima on, 91 

 Polystigma fulvum on, 98 



Prunus spinosa, Dodder on, 34 

 Exoascus Pruni on, 131 

 Polystigma rubrum on, 98 

 Valsa on, 88 



Pseudo-parasites amongst cryptogams, 



35 

 Pseudotsuga Douglasii, see Fir, 



Douglas 

 Puccinia Asparagi, 156 



coronata, 156 



graminis, 155 



straminis, 156 



striaeformis, 156 

 " Pugging," 217 

 Pure woods specially liable to disease, 



i, ii 



Pycnidium of Cucurbitaria, 88 

 Pyrenomycetes, 69, 72 

 Pyrus, see also Apple and Pear 



Raestelia cancellata on, 158 

 Pythium de Baryanum, 66 



Ouercus, see also Oak 



Cerris, Loranthus on, 31 

 Quickens, see Triticum repens 

 Quinine, 230 



Rabbits, Barking by, 241 

 Red-rot of birch, 206 



spruce known to early writers, 



i 

 Trametes radiciperda, a cause 



of, 1 86 

 "stripe," 215 



Rejuvenescence, Annual, of trees, 7 

 Remedial measures against parasites, 



54 



Reserve materials in regard to prun- 

 ing, 260 



Resin-ducts, 232 

 flux, 210 

 glut, 210 

 leader, 175 

 top, 175 



Resinous degeneration, Early mention 

 of, i 



saturation of wood,. 234 

 Resistance to disease, Individual, 7 

 Resting-mycelium, 43 

 Rhamnus, ^Ecidium on, 156 

 Rhinanthese as partial parasites, 



24 



Rhinanthus Crista-galli, a partial para- 

 site, 24 



Rhizina undulata, 123 

 Rhizoctonia violacea, 82 



