674 



Journal of Agricultural Research 



Vol. XV 



Heart— Page 



condition in brisket disease 409-411 



weight in — 



guinea pig 411 



rabbit 411 



Heat production and emission in feeding 



experiment 277-278, 284-2S6 



Hedgehog gourd. See Cucuinis dipsaccus. 

 Helianihus annuus, production of injected 



areas due to freezing 86 



Hemiptera, found on imported orchids 263 



Hesperethusa crenulata, susceptibility to 



Pseudomonas citri 662-665 



Histological Studies on Potato Leafroll 



(paper) 559-570 



Holcus halepensis sudanensis. S^ti. Andro- 

 pogon halepensis sudanensis and Sorghum 

 halepensis. 

 Hordeum — 

 juhaiwm — 



source of Puccinia gratninis triiict trans- 

 ferred to semicongenial hosts 242 



source of Puccinia graminis in bridging- 

 host experiment 230 



Pusillum, used in bridging-host experi- 

 ment 230-249 



spp., used in bridging-host experiments . . 223-249 

 vulgare — 

 reported infected with timothy rust 



through bridging host 222 



source of Puccinia graminis (ritici trans 



ferred to semicongenial hosts 242 



Hubbard squash. See Cucurbiia maxima. 

 Humin nitrogen in healthy and blighted 



spinach 399-404 



Humus extracts of mulch, plowsole, and sub- 

 soil, analysis 508 



Hunter, O. W. (paper): Bacteriological 



Studies on Alfalfa Silage 571-593 



Hydrangea, production of injected areas due 



to freezing 85 



Hydrate, anmionium, used in experiments 



with plow.sole 508 



Hydrochloric acid. See Acid, hydrochloric. 

 Hydrocyanic-acid gas — 



effect on subterranean larvae 133-136 



fumigation of cattleya orchids 263-268 



generation of 134 



Hydrofluoric acid. See Acid, hydrofluoric. 

 Hydrogen — 

 electrode, used in titration of silage extract 1 18-127 



in gaseous excretion 273,284 



peroxid, used in determining catalase 



content of seeds 140-144 



Hydrogen-ion concentration of — 



pi ant sap, changes in during freezing 98-101 



silage extract 118-127 



Hydroquinone — 

 oxidaseof Johnson grass not active toward.. 162 

 test for oxidase in — 



frozen cabbage leaves 88 



normal and blighted spinach 377-380 



Hydroxid — 

 barium, used in determining nitrogen in 



spinach 399-404 



sodium — 

 in alfalfa silage 586-590 



Hydroxid — Continued. Page 



sodium Continued. 



used to — 

 determine catalase activity of seeds. ... 139 

 determine water-soluble nitrogen in 



spinach 398-404 



neutralize hydrogen peroxid 142-144 



Hymenoptera, found on imported orchids. . . 263 



Hyphantria cunea, host of Limnerium validum . 458 



Hypochnus solani. Syn. Corticium vagum. 



Hystrix patula, source of Puccinia graminis in 

 bridging-host experiment 233 



Inheritance of characters of crosses between 

 dairy and beef cattle 1-57 



Intestinal trichinse. See Trichinella spiralis. 



Ipomoea batatas — 



storage-rots 337-368 



varieties susceptible to blaekrot 346 



Irish potatoes. See Solanum tuberosum. 



Iron in — 



greensand 483-492 



mulch, plowsole, and subsoil 508-516 



normal and blighted spinach 371-375 



Isoeugenol, used to determine oxidase activ- 

 ity in normal and blighted spinach 377-380 



Jack pine. See Ptnus banksiana. 



Japanese crookneck squash. See Cucurhita 

 moschata. 



Java blaekrot of Ipomoea batatas — 



description 347-348 



inoculation experiments 348-349 



Jenkins, Anna E. (paper): Brown Canker of 

 Roses, Caused by Diaporthe umbrina .... 593-600 



Jodidi, Samuel L., et. al. (paper): Physiolog- 

 ical Studies of Normal and Blighted 

 Spinach 369-408 



Johnson grass. See Sorghum halepensis. 



Jime beetle, green. See Cotinus nitida. 



Kamani nuts. See Terminalia caiappa. 



Kellogg, Edward H., et al. (paper): Physio- 

 logical Studies of Normal and Blighted 

 Spinach 369-408 



Kelly, James W., et. al. (paper): Physiologi- 

 cal Studies of Normal and Blighted 

 Spinach 369-408 



Kjeldahl method used in determination of 

 silage extract 129-131 



Lachnosterna sp., larvae, effect of hydrocyanic- 

 acid gas on 134-136 



Lactic acid. See Acid, lactic. 



Lagcnaria vulgaris, host plant of Bacterium 

 lachrymans 206 



Larvse, effect of hydrocyanic-acid gas on. . . 133-136 



Lasiodiplodia nigra, causal organism of rot in 

 Ipomoea batatas 347 



Latuca sativa, production of injected areas 

 due to freezing 86 



Lavanginae, susceptibility to Pseudomonas 

 citri 662-665 



Leaf roll of Solanum tuberosum 559-57° 



Leaf spot, angular, of cucumber 201-220 



Lee, H. Atherton (paper): Further data on 

 the Susceptibility of Rutaceous Plants to 

 Citrus-Canker 661-666 



Lepidoptera, found on imported orchids 263 



Leptoterna — 

 dolabrata. See Miris dolabratus. 

 id. See Mtris dolabratus. 



