769 



Nuclear apparatus of yeasts, 135; divi- 

 sion in yeasts, 136; phenomena in 

 fleshy fungi, 218; in rusts, 192, 193; 

 phenomena of fleshy fungi, students 

 of problems, 218, 219 



Nuclease, 58, 59 



Nuclei in fungous cells, 53 



Nucleus in bacteria, 23 



Number of spores produced, 63 



Nummularia BuUardi on beech branches, 

 164 



Nutrient solutions, 592-595 



Nutrition of bacteria, classification ac- 

 cording to, 28 



Nutritive disturbance as cause of disease, 

 328; tissues in galls, 398 



Nyctalis asterophora, parasitic, on 

 Russula nigricans, figure of, 43 



Oak, 526; decay, 526; root-rot, 530 



Oat, 531; rust, 531; crown rust of, 202 



Obligate parasite, 42; saprophyte, 42 



Qidema, 352; of manihot, 567; figure of, 

 568 



Oenothera Lamarckiana, 328 



Oidiospores, 50 



Oidium lactis in Matzoon, 141 



Oils in fungi, 53, 56 



Olive, Edgar W., work on rusts, 191; 

 cited, 13 



Onion, 531; smut, 531 



Oochytrieae, 117 



Oolysis, 337 



Oomycetales, 43, 50; bibliography of, 

 118, 119; characters of, 107; key to 

 families, 109; motile cells in, 52; 

 occurrence of, 108; sexual reproduc- 

 tion in, 107 



Oomycetous fungi, host list, 115 



Oospora scabies, occurrence of, 83 



Oospores, 50 



Orange, 533; black-rot, 533^ fruit-rot, 

 533; juice, 598 



Orobanchaceae, parasites of, 299 



Orobanche, as a parasite, 299; minor, 



figure of, 300 

 Organized ferments, 56 

 Orton, W. A., on quarantine, 317 

 Osmomorphosis, 404 

 Ostwald, mentioned, 57 

 Oyster mushroom, 738 

 Oyster-shell scale, figure of, 276 

 Oxidizing enzj'mes, 59 



Pachyma cocos, 72; malacense, sclero- 



tium of, 72 

 Pallor, 342 

 Panaschiering, 326 

 Parachromatophorous, 26 

 Paraffin method, 656 

 Paralyzers, 57 

 Parasite, 42; chlorophylless, 298; green, 



298; on roots, 299 

 Parasitic algae, 391 

 Parasitism of lichen fungi, 79 

 Paratrophic bacteria, 33; organisms, 28 

 Parmelia perlata, figure of, 80; on 



trunks of trees, 83 

 Pasteurization, 625 

 Pasteur mentioned, 56 

 Patellariacese, 169 

 Pathogenic fungi, study of, 639 

 Pathologic plant anatomy, 354; tissues, 



mechanic development of, 403, 404, 



405 

 Pathologist, character of work of, 341 

 Pathology, special plant, 411 et seq. 

 Patterson, Flora W., bulletin of, 244 

 Pea, 534; pod-spot, 534 

 Peach leaf cure, 534; yellows, 315, 573 

 Pear, 536; blight, experiments with, 



644, figure of experiment, 645 

 Peloria, 329, 337 

 Peltigera canina on ground, 83 

 Penicillium atramentosum, figure of, 



713; bif orme, figure of , 7 1 6 ; brevicaule, 



description of, 709; figure of, 709; 



Camemberti, description of, 706, 707; 



figure of, 706; chrysogenum, 711; 



