1920] 



INDEX OF SUBJECTS. 



961 



Hydrogen — 



and nitrogen mixture, preparation. 220. 



electrode, new cell, description, 612. 



perosid decompoaition in pasteurized 

 milk. 206. 



pero.\id. di.siiifectiug power, 78. 

 Hydrogen-ion concentration — 



determination for niill£ grading, 015. 



effect on activation of pepsin, 611. 



effects on seed germination and growth, 

 524. 



of bacterial cultures, 383. 



of blood as affected by higli altitudes, 

 .-.65. 



of culture media, variations in, 381. 



of soils as affected by fertilizers, 423. 



of soils, colorinietric determinations, 

 211. 



of soils, relation to lime requirements, 

 421, 515. 



of solutions, salt effects on value, 313. 



variation in fresh milk, N.Y. State, 578. 

 Hydrophobia. (See Rabies.) 

 ^-Hydroxyglutamic acid, synthesis, 111. 

 nylrmiiia strigoaa, chomotropic response, 



554. 

 Ilymcnolepsis carioca, notes, Okla., 79. 

 Hymenoptera — 



entoraophagus parasitism in, 457. 



North American, new species, 857. 



new species, description, 259. 

 Hyperaspis campestris, notes, 252. 

 Ilypochnua sp., notes, 444. 

 Ilypodenna spp., summai-y of informatioD, 



55. 

 Ice — 



cream, analyses. Conn. State, 859. 



cream, fillers for. Wash., 780. 



storms, papers on, U.S.D.A., 119. 

 Icerya purchasi. (See Cottony cushion- 

 scale. ) 

 Ichneumon flies — 



new genera and species, 857. 



notes, 858. 

 Ichneumoninjp, Holarctic tribes, 858. 

 Ichthyomethia, revision of genus, 328. 

 Idaho — 



Station, notes. 198, 497, 699. 



Station, publications for free dlstribut- 

 tlon, 496. 



Station, report, 98. 



University, notes, 198, 699. 

 Illinois University, notes, 198. 

 Immigration laws of Bolivia, synopsis, 94. 

 Immune sera, coagglutinins in, 581. 

 Immunity — 



of fowls to cholera, 278. 



production, relation to absorption rate 

 of antigen, 381. 



reactions, analyses by colorimetric pro- 

 tein determinations, 181. 



relation to complementary and opsonic 

 functions, 273. 



research, progress during the war, 76. 

 Immunization, (fiee Anthrax, Hog cholera, 

 etc.) 



Inanition, effect on resistance of red blood 



corpuscl<>8, 63. 

 " Inconstant," use of term, 867. 

 Incubators, devices for regulating temper- 

 ature, 822. 

 Indiana Station — 



experimental orchard, report, 237. 

 noti.'S, 99, 198, 398, 799. 

 report, 397. 

 Indicators, equation for pH determination 



of soils, 211. 

 Indigo — 



Insects affecting, 252, 

 Psylla isitia on, 451. 

 Indu.strial — 



by-products as feeding stuffs, 170. 

 prosperity in 1920, basic facts, 92. 

 Infants — 



cholesterol synthesis by, 769. 

 feeding — 



artificial, 462. 

 butter flour for, 567. 

 directions, 167. 

 milk powders for, 566. 

 rOle of vitamins in, 166, 567, 663. 

 with milk from cows at end of 

 lactation, 272. 

 metabolism, 166. 

 nursing, pellagra in, 668. 

 (See also Children.) 

 Infections, sputum-borne, control, 261. 

 Influenza, equine. (See Pleuro-pneumonia.) 

 Influenza-pneumonia, transmission by eat- 

 ing utensils, 261. 

 Inheritance. (See Heredity.) 

 Inoculation chamber, iceless refrigerator 



for, 444. 

 Insect — 



behavior, treatise, 50. 

 powder adulteration, U.S.D.A., 352. 

 survey, N.C., 450. 

 Insecticides — 



adulteration, detection, U.S.D.A., 353. 

 analyses. Me., 339 ; N.J., 37. 

 effect on plants, N.H., 44. 

 law in Maine, Me., 339. 

 investigations, Oreg., 755. 

 use in Quebec, 844. 

 use in South Africa, 834. 

 (See also Sprays and specific forms.) 

 Insects — 



as carriers of plant diseases, 842. 

 chemotropic responses of, 553. 

 control, 842. 

 control, application of bioclimatic law, 



U.S.D.A., 509. 

 control in National Forests, 148. 

 dissemination by wind, U.S.D.A., 157. 

 dried, from Mexico, use in poultry 



feeds, 53. 

 forest. (See Forest insects.) 

 fungus hosts of. lists, 659. 

 fungus parasites of, 250. 

 garden. (See Garden insects.) 

 in British Guiana, annual loss caused 

 by, 850. 



