122 INDEX TO YEARBOOKS, 1901-1905. 



Precipitation, California, discussion, 1902, 188-198. 



relation to early growth of cotton, 1904, 142. 



yield of corn, article by J. Warren Smith, 1903, 215-224. 



charts, description, and discussion, 1903, 216- 

 224. 

 San Francisco, tables, 1902, 192-197. 

 See also Rainfall; Moisture; Weather. 

 Prepotency, importance in breeding beet seed, 1904, 346. 

 Preservation, timber, recent progress, article by Hermann von Schrenk, 1903, 427^40. 



remarks, 1904, 60. 

 Preservative, food, experiments. Department of Agriculture, data, tables, 1903, 295- 

 301. 

 use of formaldehyde, 1905, 482. 

 Preservatives, food, effect upon health, investigations, 1903, 54-55; 19,04, 63-65. 

 selection of Department experimental class, 190^, 292-293. 

 in foods, determination of effect on health and digestion, article by 

 H. W. Wiley, 1903, 289-302. 

 relation of food inspection, 19.04, 157. 

 use for protection of telephone poles, 1905, 458-462. 

 wood, tests of efficiency by settmg pples, 1905, 462-464. 

 Preserved meats, study, remarks, 1901, 58. 

 Preserves, cost of nutrients, table, 1905, 319. 

 game, 1903, remarks, 1903, 569. 

 jelly, etc., composition, table, 1905, 310. 

 use of citrange, 1904, 229, 235. 

 Preserving industries, use of sugar, note, 1901, 500. 

 Pressures, atmospheric, on Pacific coast, notes, 1902, 187. 



winds and rain in California in January and February, discussion with table 

 and charts, 1902, 198-200, 201-203. 

 Prevost, L., efforts to establish the silk industry in California, 1903, 138. 

 Price, Overton W., article on "The influence of lumber industries," 1902, 309-312. 

 Prices. See Crops; Corn; Wheat; Horses; Cattle, etc. 

 Prideof Texas peach, remarks, 1901, 385. 

 Printing cost, reduction, 1904, 114. 



Department, cost, discussion by Secretary, 1902, 120. 

 report of Department to Joint Committee of Congress, remarks, 1905, 93. 

 Prionoxystus rohinise, description, life history, injuries, control, 1903, 326-327. 

 Prison dietaries, remarks on study, 1901, 394. 



labor for roads, note, 1903, 462. 

 Prisoners, benefits of employment in highway work, 1901, 412. 

 on roads, North Carolina law, 1901, 322. 

 See also Convicts. 

 Prisons, food investigations, notes, 19.02, 108. 

 Production. See Crops; Corn; Wheat; Horses; Cattle, etc. 

 Proliferation, cotton, cause of death of boll-weevil larvae, 1904, 488, 500-501. 



study, as means of control of boll weevil, 1904, 502. 

 Propagating houses and testing gardens, Department, work, 1905, 298-299. 

 Propagation, avocado, 1905, 442. 



guava, remarks, 1905, 453. 

 Jordan almond, 1902, 480. 

 sapodilla, 1905, 449. 

 Proteids, production in plant growth, note, 1901, 169. 



Protein as essential in food, and supply by various kinds of food, 1902, 387-406. 

 averages per person per dav, 1901, 405. 

 content of flour, notes, 1903, 352, 356, 357, 358, 359, 360, 361. 

 foods, grouping according to price, 1902, 405. 

 macaroni wheat, discussion, 1903, 331-334. 

 deficiency in corn and question of increase, 1902, 221. 

 formation, relation of potassium, 1901, 163. 

 in vegetables, note, 1902, 402. 



wheat, influence of environment, 1901, 306. 

 See also Gluten. 

 Protozoa as parasites, remarks, 1905, 140. 



parasitic, transmission, 1905, 164-166. 

 Provisions, freight rates, Chicago to Europe, 1902, 852; 1903, 679; 1904, 720; 1905,759. 

 Prune industry of Pacific coast, encouragement, 1901, 32. 



