84 BULLETINS OF THE BUREAU OF PLANT INDUSTRY. 



Bulletin. Page. 



Poa, or bluegrasses, key to commercial seeds 84 19 



seeds of common species in her- 

 baria 84 18 



sudetica, description 84 30-31 



growing' and handling 84 14 



See also Bluegrass and Bluegrasses. 



Poisonous action of Johnson grass, paper 90 31-34 



plants, California, northwestern 12 73-74 



Nevada and Oregon 15 41-42 



Pollen tube in Zamia. development 2 22-39 



Pollination, artificial, hiilletin 22 1-48 



experiments with blossoms of cotton 22 19-22 



Datura tatula 22 19 



orange 22 23-25 



tobacco 22 10-18 



tomato 22 26-3.3 



premature, injurious efPects, with general notes 

 on artificial pollination and the setting of fruit 



without pollination, bulletin 22 1-48 



Polyporus fraxinophilus, disease of white ash, hnlletiii 32 1-20 



distribution 32 10 



method of attack 32 11 



remedies 32 18 



sporophores 32 12-14 



Porto Rico, avocados 77 23-24 



34-35 



Castilla (rubber) culture 49 17 



mango, huUetiii : 28 1-38 



Potassium bromid, effect on plants 45 27 



chlorid, value for buckwheat 45 _ 24-25 



phosphate as a cell constituent 45 19-20 



salts, formation of starch and protein 45 28-30 



physiological superiority 45 34-35 



replaced by rnbidinm salts 45 31-32 



Potato culture in Europe 87 9-12 



diseases, blackleg 87 17-18 



filosite, or growing-ont 87 13 



internal brown-spot .■ 87 12-13 



late-blight and rot 87 19-28 



leaf-spot 87 13-14 



scab and scablike diseases 87 14-17 



resistance : ; 87 35-36 



sweet, in central Texas 13 69 



Potatoes, best varieties in United States and Canada 87 33-35 



disease resistance, hnUetin 87 1-39 



resistant varieties, America 87 28-31 



Europe 87 ' 31-36 



dry-rot due to Fusarium oxysporum, bulletin 55 1-62 



effect of disease 55 13-19 



fertilizers on resistance 55 19-27 



literature 55 61-62 



remedial measures 55 52-54 



Powell, George Harold, and Fulton, San ford Hamilton, bul- 

 letin entitled — 



"Cold storage, Avith special reference to the pear and 



peach" 40 1-28 



"The ajjple in cold storage" 48 1-66 



Prairie dogs 67 46 



Precipitation. See Painfall. 



Preliminary study of the germination of the spores of Aga- 



ricus campe.stris and other basidiomycetous fungi, bulletin.. 16 1-43 



Prickly pear and other cacti as food for stock, bulletin 74 1-48 



cutters 74 17-19 



effect of food upon stock 74 33-35 



ensilage 74 35-36 



101 



