602 



AGRICULTURAL INDEX 



Hydraulic rams — Continued 

 J-iifting water from small spring. Rural N Y 



78:1069 Jl 12 '19 

 Pumping water with ram. plan Rural N Y 79: 

 1696 N 6 '20 

 Hydraulics 

 Centrifugas gidraulicas. B. C. Lechler. El 

 Mundo Azucarero 9:41-4 S '21 



See also Culverts; Hydrometers; Irriga- 

 tion; Water flow 



Hydrocotyle rotundifolia. See Lawn pennywort 



Hydrocyanic acid 



Commercial liquefaction of hydrocyanic acid. 



G: P. Gray, il Cal State Comm Hort B v 



8:69-71 F '19 



Factors influencing fumigation results. R. S. 



Woglum. Cal Cultivator 55:147 Ag 7 '20 

 Liquid hydrocyanic acid as a fumigator for 



citrus trees. Ag News 19:314 O 2 '20 

 Production of hydrocyanic acid. Chem & 

 Metallurgical Eng (10th av at 36th st, N.Y. 

 25c) 22:329 F 18 '20 

 Selection of a type of pe-gya bean (phaseolus 

 lunatus var.) with a low prussic acid con- 

 tent, in Burma. F. J. Warth and Ko Ko Gyi. 

 Int R Sci & Prac Ag 9. no 11:1311-13 N '18 

 8ee also Sorghum — Hydrocyanic acid con- 

 tent; Sudan grass — Hydrocyanic acid con- 

 tent 

 Hydrocyanic acid gas 

 Cyanide gas remedy for scale insects. C. P. 

 Lounsbury. il J Dept Ag S Africa 2:437- 

 52 My '21 

 Dosage schedule for citrus fumigation with 

 liquid hydrocyanic acid. R. S. Woglum. J 

 Econ Entom 12:357-63 O '19 

 Experiments on the control of the root-knot 

 nematode heterodera radicicola (Greef) 

 Mueller. L. P. Byars. il Phyt 9:93-103 F '19 

 Fumigation of cattleya orchids with hydro- 

 cyanic-acid gas. E. R. Sasscer and H. F. 

 Dietz. il J Ag Research 15:263-8 N 4 '18 

 Fumigation of citrus plants with hydrocy- 

 anic acid: conditions influencing injury. R. 

 S. Woglum. bibliog il U S Ag B 907:1-43 

 '20 

 Fumigation of greenhouses with hydro- 

 cyanic acid gas. W: Moore. Minn Ag Ext 

 C 3 4p '19 

 Fumigation with liquid hydrocyanic acid; 

 physical and chemical properties of liquid 

 hydrocyanic acid. H. J. Quayle; G: P. Gray 

 and E. R. Hulbirt. il Cal Ag Exp B 308: 

 393-428 '19 

 Casing trees against insect pests. H: 

 Thompson, il Am Fruit Grower 39:9 O '19 

 How to avoid injury to young trees in fumi- 

 gating with liquid gas. H. J. Quayle. il Cal 

 Citrograph 5:322 Ag '20 

 Hydrocyanic acid gas generator, il Cal Cul- 

 tivator 55:283 S 4 '20 

 Hydrogen cyanide fumigation. E. E. Clayton. 



bibliog il Bot Gaz 67:483-500 Je '19 

 Recent results in the fumigation of citrus 

 trees with liquid hydrocyanic acid. R. S. 

 Woglum. il J Econ Entom 12:117-23 F '19 

 Revised dosage schedule for use of liquid 

 hydrocyanic acid gas. Cal Cultivator 55: 

 313 S 11 '20 

 Stratification of liquid hydrocyanic acid as 

 related to orchard fumigation. R. S. Wog- 

 lum and M. B. Rounds, il J Econ Entom 12: 

 300-2 Ag '19 



Use of hydrocyanic acid gas for greenhouse 



fumigation. N J Ag Exp Rep 1917:467-9 '18 

 Hydroelectric plants 

 Harnessing the farm creek. P. S. Rose, il 



Country Gent 85:6-7+ Ap 3 '20 

 Hydroelectric power 

 Decret-loi portant des mesures pour favoriser 



la production et I'utilisation de I'Snergie 



hydro-61ectrique en Italic. Int Yearbook Ag 



Leg 1919:321-3 '20 

 Electricity from farm streams. Nor' -West P 



39:599 Ap 20 '20 

 Electricity on the farm. O. C. Ballhausen. 



il Ag Gaz of New South Wales 32:635-8 S 



Equitable distribution of hydro power. Farm- 

 er's Advocate 56:672-3 Ap 21 '21 



Hydro-electric development. E. Parry. J Ag 

 New Zealand 18:119-22 F '19 



Hydro on the Ontario farm. Farmer's Advo- 

 cate 56:705 Ap 28 '21 



Hydro power for the Canadian farmer, il Sci 

 Am (233 Broadway, N.Y. 10c) 122:93 Ja 24 



Some hydro facts. D. Robinson. 11 Dakota F 

 40:1952 D 1 '20 

 Hydrogen-ion concentration 

 Acidity and acidimetry of soils: investiga- 

 tion of acid soils by means of the hvdrogen 

 electrode. H: G. Knight. J Indus & Eng 

 Chem (1709 G st, N.W., Washington, D.C. 

 GOc) 12:457-64 My '20 

 Activity of water in sucrose solutions. W. E. 

 Garner and I. Masson. Philosophical M (Red 

 Lion Court, Fleet st, London 5s) 6th ser 41: 

 4S4-6 Mr '21 

 Catalase, hydrogen-ion concentration, and 

 growth in the potato wart disease. F. 

 Weiss and R. B. Harvey. J Ag Research 

 21:589-92 Jl 15 '21 

 Chemical and physical behavior of proteins. J. 

 Loeb. Chem & Metallurgical Eng (10th av at 

 36th st, N.Y. 25c) 24:550-3 Mr 30 '21 

 Color standards for the colorimetric measure- 

 ment of H-ion concentration. L: J. Gil- 

 lespie, bibliog J Bact 6:399-405 Jl '21 

 Color standards for the colorimetric mea- 

 surement of H-ion concentration pH 1.2 to 

 pH 9.8. L. S. Medalia. il J Bact 5:441-68 

 S '20 

 Colorimetric determination of hydrogen- 

 ion concentration without buffer mixtures, 

 with especial reference to soils. L: J. Gil- 

 lespie, bibliog Soil Sci 9:115-36 F '20 

 Determination of acidity and titrable nitrogen 

 in wheat with the hydrogen electrode. C. O, 

 Swanson and E. L. Tague. J Ag Research 

 16:1-13 Ja 6 '19 

 Determination of hydrogen-ion concentra- 

 tion by the colorimetric method and an 

 apparatus for rapid and accurate work. B. 

 Van Alstine. bibliog il Soil Sci 10:467-79 D 

 '20 

 Effect of chemical fertilisers on the hydro- 

 gen-ion concentration of soils. F. W. Morse. 

 Int R Sci & Prac Ag 10,no 4:394-5 Ap '19 

 Effect of hydrogen ion concentration in water. 

 R. E. Greenfield. Can Engineer (62 Church 

 st, Toronto, Ont. 10c) 40:335-6 Mr 31 '21 

 Effect of reaction of solution on germination 

 of seeds and on growth of seedlings. R. 

 M. Salter and T. C. McIIvaine. bibliog il 

 J Ag Research 19:73-9 Ap 15 '20 

 Growth of certain bacteria in media of differ- 

 ent hydrogen ion concentrations. B. Cohen 

 and W: M. Clark, bibliog J Bact 4-:409-27 Jl 

 •19 

 Hydrogen-ion concentration measurements 

 of soils in connection with their lime-re- 

 quirements. J. S. Joffe. bibliog Soil Sci 

 9:261-6 Ap '20 

 Hydrogen-ion concentration of certain 

 three-salt nutrient solutions for plants. A. 

 G. McCall and J. R. Haag. Soil Sci 10: 

 481-5 D '20 

 Hydrogen-ion concentration of plant juices. 

 C. B. Clevenger. bibliog Soil Sci 8:217-42 S 

 •19 

 Hydrogen-ion concentration relations in a 

 three-salt solution. H: F. A. Meier and C. 

 E. Halstead. bibUog 11 Soil Sci 11:325-52 My 

 '21 

 Hydrogen-ion concentration shown to have 

 relation to growth of wild plants. Ag Lime 

 News B (Nat. lime assn., 918 G st, N.W., 

 Washington, D.C.) v l,no 2:2 My '20 

 Influence of hydrogen-ion concentration upon 

 enzymic activity of three typical amylases. 

 H. C. Sherman and others. Am Chemical 

 Soc J (Am. Chemical Soc, C. L. Parsons, 

 sec, Box 1505, Washington, D.C. $6 per yr.) 

 41:231-5 F '19 

 Influence of soil reaction on the growth of 

 alfalfa. J. S. Joffe. bibliog Soil Sci 10:301-7 

 O '20 

 Influence of varying amounts of sulfur in the 

 soil, on crop yields, hydrogen-ion concen- 

 tration, lime requirement and nitrate for- 

 mation. J. G. Lipman and others, bibhog 

 Soil Sci 12:197-207 S '21 



