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DEPARTMENT OF AGRICULTURE, BULS. 151-175. 



Pipe — Continue d . 



machine-b anded — 



coating with asphaltum 



description and manufacture, note 



wood, laying and maintenance, cost, etc 



wood, use and cost 



wood, use for municipal water supply, objec- 

 tions 



woods used, construction, couplings, etc 



stave, joining to steel pipe, methods 



wood — 



carrying capacity, measurement formula 



joining, methods 



joints, types, descriptions 



use for conveying irrigation water 



Pistache nut, growing in San Antonio region, experi- 

 mental work 



Pissodes strobi, injury to white pine 



Planesticus migratorius. See Robin. 



Planting, forest nursery stock, methods, cost, etc 



Platopuntia — 



engelmannii, occurrence and chemical composition 

 lindheimeri, description, occurrence, chemical com- 

 position, etc *. 



tuna, description, occurrence and chemical compo- 

 sition 



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

 Plowing — 



cost of fall and spring work, comparisons 



wheat growing, experiments with different methods 



at Nephi experiment farm, Utah 



Plum- 

 American, stock for San Antonio region 



orchard, distance between trees, San Antonio 



region 



Plums — 



derivation from native American species, varieties. . 



geographical origin, by States 



growing in San Antonio region, tests of varieties 



hybrid varieties, parentage, etc 



hybrids and varieties, list 



native varieties and hybrids — ■ 



list, sources of material in preparation 



origin and species, list 



parentage of varieties 



species, abbreviations used in designation 



stock for San Antonio region 



varieties, classified by species 



Pluteus, genus, characters, description of species, etc 



Poison oak. California, dissemination of seed by robins. . . 



Polyporaceae, characters of family, key, etc 



Polyporus — - 



genus, characters, descriptions of species, etc 



schweinitzii. damage to lodgepole pine 



Polystictus, genus, characters, descriptions of species, 



etc 



Pomegranate growing. San Antonio region, experiments, 



varieties tested, etc 



"Poor man's weather glass." description and occurrence. 

 Poplar, yellow, planting in eastern United States, re- 

 marks 



Populus deltoides. See Cottonwood. 



Porcupines, injury to lodgepole pine 



Portsmouth soils, comparison with sassafras soils, note.. 



Bulletin. 



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