772 



Powdery dry-rot of potato, 543 

 Powdery mildew of cherry, 491; of 



lilac, 522 

 Predisposing causes of disease, 272 

 Preservation of wood, 692; of fungi, 726, 



727 

 Prevention of disease, bibliography of, 



318 

 Preventive measures, 319 

 Prints of spores, 728 

 Prod'uction of spores, 63 

 Prolification, 338 

 Projection apparatus, 657 

 Prophylaxis, 298, 317 

 Prosoplasms, 376, 395 

 Prosoplastic hypertrophy, 364 

 Protease, 58, 59 

 Protective tissues in galls, 398 

 Proteins, splitting of, ^$, 59 

 Protista, 7 

 Protoasciineae, 131 



Protomyces, occurrence of species, 121 

 Protomycetacese, 121 

 Protophyta, 7 

 Protoplasm of fungi, 53' 

 Prototrophic organisms, 28 

 Protozoa, 7 

 Pruning careless, 310; unskillful, figure 



of, 310 

 Pseudomonas, 31?, 36; brassicse, 485, 



486, 487; campestris, 36, 645; europaeus 



37; hyacinthi, 36; indigofera, length 



and breadth of, 22; putida, 37; 



pyocyanea, 37; Stewarti, 644; syn- 



cyanea, 37; tumefaciens, 34, 388, 643; 



involution forms of, 365; vascularum, 



.36 

 Pseudopeziza medicaginis, 169; on 



alfalfa, 476, 477 

 Ptomaines, 23 



Pucciniaceae, characters of family, 201 

 Puccinia asparagi, 483, 484; character 



of, 191; coronifera, 531; forms of, 



202; coronata, forms of, 202, 203; 



glumarum, forms of, 203; graminis, 



560; distribution of, 84; figure of, 



188; forms; of, 191, 201, 202; malva- 

 cearum, 206, 517; figure of, 518; 

 species of, 203, 204, 205, 206 



PufT-balls, 239, 240 



Puffing of spores, 66 



Pumps for spraying, figures of, 691 



Punks, 342 



Pustules, 342 



Putrefaction, ^3 



Pycnidial pustules of chestnut blight, 

 499 



Pycnidiospores, 50 



Pycnidium, 50 



Pycnium, 188 



Pycnoconidia, 50 



Pycnospores, 50; 188; germination of 

 chestnut blight, figures of, 501 



Pyrenomycetiinese, characters of, 159, 

 1 60 



Pyronemaceae, characters of, 165 



Pyronema, life cycle contrasted with 

 fern, 126; confluens and sexuality, 

 165; reinvestigation of , by P. Claussen, 

 123; work on by R. A. Harper, 122 



Pythiacystis citriophora, 520; on lemon, 



85 

 Pythium de Baryanum, distribution of, 

 84 



Quarantine to prevent disease, 317 

 Quercus reticulata parasitized by Cono- 



pholia mexicana, 299 

 Quercus Wislizeni, figure of section of 



gall, 399; gall on, 398 

 Quick-drying varieties of plants, 273 



Races of moulds, 95 



Rachitism, 338 



Raffinase, 58 



Ralfinose, 58 



Rafflesiaceae, parasites of, 301 



Raspberry anthracnose, 544 



Rate of spore fall, 64 



