INDEX. 19 



Bulle- 



Oil — tin No. Page, 

 horsemint — 



phenol content 372 8 



yield of different species 372 2 



yield per acre 372 10 



sprays, sooty-mold control in peach orchards, formulas and experi- 

 ments 351 67-86 



Oklahoma rocks, road-building, physical tests 370 57-58 



Okra, food of boll weevil 358 8-9 



Orchard grass — 



curing, moisture loss during early stages 353 29 



moisture content at different stages of curing 353 9-10 



Oregon rocks, road-building, physical tests 370 58 



Pacific Northwest, brown rot of prunes and cherries, bulletin by Charles 



Brooks and D. F. Fisher 368 1-10 



Pavements, brick, construction, requirements and suggestions 373 8-21 



Peach orchards, insect enemy, terrapin scale, bulletin by F. L. Siman- 



ton 351 1-96 



'Peco." /See Larkspur. 

 Peirce, Vernon M., and Charles H. Moorefibld, bulletin on 



"Brick roads" 373 1-40 



Pennsylvania rdcfes, road -building, physical tests 370 59-72 



Peters, J. Girvin, bulletin on "Forest conservation for States in the 



southern pine region " 364 1-14 



Phenol, yield per acre of horsemint 372 10 



Phosphorus, soil content, lesson for movable school 355 47-50 



Pine — 



forests — 



grazing, practices and damage in South 364 7 



South, damage by fire, losses, and suggestions for protection . . . 364 4-7 



insect damage, relation to forest fires 364 7 



lands, cut-over, reproduction, menace from forest fires 364 5-6 



region, southern, forest conservation, bulletin by J. Girvin Peters. . 364 1-14 



yellow, timber in South and cutting rate 364 3^ 



Pines, mistletoe-infected, growth rates of different species 360 2-13 



Pink corn worm, destructiveness on corn in the crib 363 1-20 



Pink worm. 8ee Corn worm, pink-. 



Plant growth, study in relation to soils, lesson for movable school 355 10-17 



' ' Poison weed . ' ' See Larkspur. 



Poisoning, larkspur, of live stock, bulletin by C. Dwight Marsh, 



A. B. Clawson, and Hadleigh Marsh 365 1-91 



Porto Rico — ■ 



cacao growing, advantages 354 35-36 



climatic conditions 354 7-9 



farming, relation to forests, practices, etc 354 13-14 



forest conditions, history, formations, and influences 354 20-39 



forests, past, present, and future, and their physical and economic 



environment, bulletin by Louis S. Murphy 354 1-99, 



fuel, use in industries 354 41-42 



geographic situation, area and extent 354 2-4 



land in, distribution, utilization, and taxation 354 9-16 



mountain ranges, formation and physical features 354 4-5 



physical features 354 2-9 



population, increase, nature, and density, historical note 354 16-17 



rocks, road-building, physical tests 370 99 



timber, supply and demand 354 39-44 



transportation facilities, discussion and suggestions 354 18-20 



Potassium, soil content," lesson for movable school 355 50-54 



Potatoes, soil requirements, lesson for movable school ._ 355 82 



Poulard wheats, characteristics 357 2-6 



Prices — 

 cotton — 



comparison with lint prices for seed cotton 375 15-16 



ginned and unginned, variations for given grade. ......... 375 8-9 



