IKDEX TO YEAEBOOKS, 1901-1905. 117 



Pineapples, crossing, process and results, 1905, 283-284. 



new varieties, Miami, Seminole, Eden, Matthams, and Gale, descrip- 

 tions, origin, name, etc., 1905, 40, 285-290 

 Pine-bark beetle, destructive, description, habits, injuries, and methods of fighting, 



1902,270-275. . 



Pine-destroying beetles, notes, 1902, 265. 

 Pinone, principal constituent of turpentine, note, 1902, 331. 

 Pines, curves snowing rates of seasoning, 1903, 430. 



tapping, improvement in method of tapping, 1902, 724. 

 Pinworms, transmission, 1905, 150. 

 Pipes, lath, use for irrigation laterals, 1903, 244. 



metal, use in irrigation, 1903, 249. 

 Piquette, making from grape pomace, 1904, 378. 

 Pissodes spp., injuries to pine reproduction, 1905, 252, 253, 254. 

 Pisum sativum, fertilization, Darwin's observations, 1905, 385. 

 Pityophthorus pruinosus. See Bark beetle. 

 Plains, crops and conditions for diversified farming, 1905, 216. 



Great, prairie dog, article by C. Hart Merriam, 1901, 257-270. 

 Plant and animal breeding, progress, article by Willet M. Hays, 1901, 217-232. 



seed introduction and distribution, article by A. J. Pieters, 1905, 291-306. 

 progress, discussion, 1903, 27; 1904, 4:7-i8. 

 lirpcding, cooperation of Department and experiment stations, 1905, 172. 

 development in nineteenth century, 1904, 120-122. 

 new creations, discussion, 1904, 45^7. 

 tendency and results, discussion, 1901, 222. 

 work of Bureau of Plant Industry, remarks, 1301, 25. 

 Department with citrus fruits, 1905, 275-290. 

 cells, effect of freezing and drought, 1901, 163. 



diseases, in United States, review by W. A. Orton, 1901, 668-672; 1902, 714- 

 719; 1903, 550-555; 1904, 581-586; 1905, 602-611. 

 nature and causes, discussion, 1904, 125-128. / 

 protection, advances, 1902, 600-601. 

 treatment, 1904, 36-37; 1905, 34-36. 

 drug. See Drug plant. 



feeding, importance, and danger of overfeeding, 1902, 553, 557. 

 food, importance of potassium, 1901, 162. 



in soil solution, study of retention, 1903, 166, 167. 

 nitrogen as constituent, 1901, 167. 



water soluble, effect of cultivation in making available, 1903, 160. 

 growing, general, needs in agricultural vocation, 1904, 164-165. 

 growth, effect of nitrogen, 1901, 168. 



soil conditions, 1901, 157. 

 function of phosphoric acid, 1901, 166. 

 influence of magnesium and lime, 1901, 161. 

 necessary soil foods, discussion, 1901, 160. 

 water as factor, 1901, 172. 

 Industry, Bureau, discovery of new methods in use of nitrogen-fixing bacteria, 

 1902, 340-342. 

 organization and duties, 1901, 612; 1902, 662; 1903, 510; 



1904, 540; 1905, 564. 

 work against cotton insects and diseases, 1904, 198, 199. 



for cotton varieties resistant to boll weevil, 1903, 105. 

 in meeting ravages of boll weevil and some diseases of 



cotton, article by B. T. Galloway, 1904, 497-508. 

 review by Secretary, 1902, 15-36; 1903, 22^5; 1904, 

 25-52; 1905, 34-51. 

 lice, control, work, 1901, 98. 



damage to wheat, 1904, 467. 

 nutrition, carbon assimilation as condition, 1901, 174. 

 physiology, educational relations, 1904, 128-132. 



relation to development of agriculture, article by Albert P. Woods, 

 1904, 119-132. 

 varieties, importance, remarks, 1901, 350. 



work, industrial progress, article by B. T. Galloway, 1902, 219-230. 

 Planter, com, failure with irregular grains of corn, 1902, 547. 



machine, advantages, 1903, 185. 

 Planting and seeding, spring, 1904, 1904, 562-565. 



