18 



DEPARTMENT OP AGRICULTURE, BULS. 326-350. 



Bulle- 

 tin No. 



Pigeons, occurrence in Porto Rico, variant names, habits and food. . 326 



Pima cotton, comparison with Yuma cotton 332 



Pine pulp, experiments and tests 343 j 



Pintails, occurrence in Porto Rico 326 



Pinus, spp., pulp, tests 343 j 



Pisobia, spp., occurrence in Porto Rico, habits and food 326 



"Plantation huller," damage to rice, note 330 



Planter, corn, service period 338 



Plegadis autumnalis, occurrence in Porto Rico, habits and food 326 



Plovers, occurrence in Porto Pico, variant names, habits and food. . 326 



Plowing, fall versus spring, irrigated lands, experiments in Idaho. . . 339 

 Plows — 



cost of different kinds, per acre and per day 338 



service period, relation to work done. / 338 



Podilymbus podiceps antillarum, occurrence in Porto Rico, habits and 



food 326 



Popple. See Aspen. 



Populm tremuloxdes. See Aspen. 



Porto Rico — 



agriculture, relation of birds 326 



bird life, abundance, habits, etc 326 



birds — 



bulletin by Alex Wetmore 326 



investigations, areas explored, itinerary 326 



introduction, discussion 326 



insects, injurious, bird enemies 326 



physiography 326 



Porzana, spp., occurrence in Porto Rico, notes 326 



Potato project, home, outline and. records 346 



Potatoes — 



crop area, percentage, and relation to labor income, Chester 



County, Pa 341 



irrigation — 



effects of different volumes of water, experiments in Idaho . . 339< 



requirements, experiments in Idaho 339 



yield, relation to farm tenure, Chester County, la 341 



Poultry — 



income on farms, percentage, and relation to labor income 341 



project, home, study outline 346 



"Profits," use of term in farm business 341 



Prcgne dominicensis, occurrence in Porto Rico, habits and food 326 



Propagation, blueberry, methods 334 



Prune industry, Oregon, extent and status 331 



Prunes — 



brown-rot, relation to shipment 331 



handling, commercial methods 331 



harvesting and grading for market 331 



maturity, relation to keeping quality 331 



precooling, effect on carrying quality 331 



precooling experiments in Willamette Valley, and effect on decay 



in transit - - - ; 331 



relation of handling and precooling to decay in transit, investi- 

 gations 331 



Willamette Valley (and cherries), handling and shipping, bul- 

 letin by H. J. Ramsey 331 



Pruning, raisin-grape, methods 349 



Publications — 



irrigation, Department 339 



roads and road-building materials 347 



53-55 



13 



42-45, 



104-114, 



135-140 



29 



35 36, 



42-45, 



104-114, 



138-140 



44 



15 



13-14 



27 



38, 40, 42 



43 



7-9 

 7-9 



17 



1-2 



4-7 



1-140 



2 



14-15 



9-11 



3 



36 



6-9 



35-36 



11, 13, 14, 



17,19 



20, 29-30 



73 



42-43 

 14-15 



25 



88-89 



3-15 



13 



24-26 

 14 

 17 

 26 



20-24 



20-24 



2-A, 15-26 



1-28 

 6-8 



58 

 28 



