26 



DEPARTMENT OF AGRICULTURE, BULS. 151-175. 



Bulletin. 



Pear — Continued . 



thrips — Continued. 



emergence from ground, time.relation of weather, 



and blossoming trees, records 



enemies, natural 



entomological classification 



food plants 



importance in economic conditions 



injury to orchards 



larvae, appearance, feeding, depth in soil, etc... 

 life cycle, description of egg, larva, pupa, etc.. 



literature 



migratory habits 



original home, theories 



pupations, stages, effect of weather, etc 



reproduction, oviposition. eggs, larvae, etc 



seasonal history 



study in Santa Clara A r alley, establishment of 



laboratory, work, etc 



trees, injury by thrips 



Pears — 



injury by pear thrips, character and extent 



growing — 



in San Antonio region, experience of G. A. 



Schattenberg 



on sassafras soils 



Peas — 



garden — 



growing on sassafras soils 



relation to vanillin in the soil, experiments 



intertilling with wheat, yield, experiments 



Pecan tree, requirements 



Pecans, growing in San Antonio region, experiments 



Pennsylvania — 



Morris ville, experiments with sulphuric acid on 



pine seed in sandy soils 



wireworm depredations, notes 



Pensauken area, geological formation and deposits 



Pepper cap, mushroom, description 



Perwermium — 



harknessii, damage to lodgepole pine, note 



montanum, damage to lodgepole pine, note 



Persian walnut, grafting on Juglans nigra stock, experi- 

 ments 



Persimmon, injury by chlorosis 



Persimmons — 



growing in San Antonio region, experiments 



stock for San Antonio region, tests, experiments, etc. 



Phallaceae, key to family 



Pholiota, genus, characters, descriptions of species, etc.. 

 Phrynosoma douglasii douglasii, enemy to wireworm — 

 Picea excelsa. See Spruce, Norway. 

 Picrasma excelsa. See Quassia. 

 Pine- 

 forests, Europe, depredations of pine-shoot moth. . . 

 lodgepole — 



life history in the Rocky Mountains 



See also Lodgepole pine. 

 Norway — 



forest plantation in eastern United States, sug- 

 gestions 



growth habits and requirements 



growth habits, value in mixtures with white 

 pine, note 



173 



24-36 



173 



51-52 



173 



22 



173 



11 



173 



7-11 



173 



4 



173 



43-49 



173 



19-21 



173 



3-4 



173 



36-38 



173 



6 



173 



49-50 



173 



38-50 



173 



50-51 



173 



1-2 



173 



4 



173 



13-16 



162 

 159 



12-14 

 31, 36, 43, 49 



159 



164 

 157 

 162 

 162 



22 



6-7 



41, 42, 43 



16 



15-16 



169 

 156 

 159 

 175 



30-31 



17 



10-11 



22 



154 

 154 



22 

 22 



162 

 162 



20 

 15 



162 

 162 

 175 

 175 

 156 



15 

 21-22 



47 

 29-30 



27 



170 



2-3 



153 



1-35 



153 



153 



32-33 

 32-33 



153 



29 



