12 DEPARTMENT OF AGRICULTURE BUI.S. 1101-1125. 



Pecan — Bulletin No. Page. 



kernel spot, and its cause, bulletin by J. B. Demaree 1102 1-15 



orchards, cover crops, suggestions 1102 12 



Pectinophora gossypiella, spread and control work in 1921 1103 43-44 



Pennsylvania — 



Japanese beetle, spread in 1921 1103 46 



lumber cut, 1920, 1870-1920, value and kinds 1119( ^^' ^?:^^A 



' ' ' \ 44-58 



Petrography, application to analysis in chemical problems ] 108 2-4 



Phytonomus posticus, outbreaks in 1921 1103 21-24 



Phytophaga destructor, outbreaks in 1921 1103 9-11 



PiERSON, Albert H., and R. V. Reynolds, bulletin on "Lumber 



cut of the United States, 1870-1920 " 1119 1-63 



... f 4 24 33 



Pima cotton, commumties growing 1111-^ 36-^9 47 



Pine- 

 cutting — 



methods, relation to reproduction, comparisons 1105 74-82 



( 56-92 



relation to reproduction 1105< iq7_iqs 



r 20-22 



foliage, injury by mistletoe infection 1112< 25 35 



lodgepole, lumber production, by States, 1920 1119 54 



reproduction — 



relation to brush disposal in forests 1105^ -. 00% 40 



relation to climate 1105 22-29, 136 



relation to soil 1105 29-35, 137 



seed — 



injury from mistletoe 1112 26-29 



production, decrease under mistletoe infection 1112 25-29, 35 



trees, number required for reproduction ■. . . 1105 11-22, 72 



yield, relation to diameter of seed trees 1105< fiQ-79 



species, adaptability for shelter-belt planting 1113 11, 14, 15 



sugar, lumber production, by States, 1920 1119 53 



timber, injury by mistletoe 1112 25, 35 



western yellow — 



lumber production, by States, 1920 1119 44 



marking practice and suggestions 1105 82-92 



mistletoe, bulletin by Clarence F. Korstian and W. H. 



Long. 1112 1-36 



reproduction, factors influencing 1105 9-135. 



reproduction, in the Southwest, bulletin by G. A. Pear- 

 son '. 1105 1-144 



reproduction, investigations prior to 1918 1105 2-3 



seed supply, relation to reproduction 1105 9 -22, 136 



seed trees, requirements for natural reproduction 1105 11-22 



white, lumber production, by States, 1920 1119 45 



yellow — 



lumber production, by States, 1920 1119 43 



mistletoe injury ' 1112 4-29 



Pines, mortality from mistletoe infection 1112 22-25, 35 



Pingue, prevalence in forests of southwest 1105J co ci 



Pink bollworm, outbreaks, spread and control in 1921 1103 43-44 



Pinus ponderosa. See Pine, western yellow. 



Planting trees for shelter belt in Northern Great Plains, coopera- 

 tion, directions, etc 1113 2-28 



Popillia japonica, introduction and spread 1103 44-46 



Poplar — • 



species, adaptability for shelter-belt planting 1113 8, 9, 12, 15 



yellow, lumber production by States, 1920 1119 49 



Porcupines, injury to pine seedlings 1105 135 



Porosagrotis ortho'gonia, outbreak in 1921 1103 19-21 



Porthetria dkpar, distribution, and infested area in 1921 1033 48-50 



Potassium iodid, solution, use in testing milk and cream 1114 2 



