Subject Index 



Abies, 90 



Abies arizonica, 102 

 Abscission: ethylene effects, 150 

 Abutilon, 30, 35, 51 

 Acacia, 30 



Acenaphthene-(5)-acetic acid, 207 

 Acer, 89, 90 



Acer saccharinum: vitality of seeds, 31 

 Acetohacter xylinus: formation of cellulose mem- 

 branes, 263-264 

 Acetylene: effects on roots, 173 



physiological effects on plants, 142-143, 152, 163 

 Acids, fatty: contact insecticides, 346 

 Acrocomia , 33 



After-ripening of seeds: butternut, hickory, wal- 

 nut, 32 

 Cotoneaster, 111 

 Crataegus, 109-111 

 Impatiens bahamina, 123-126 

 Symphoricarpos racemosus, 107-lOS 

 temperature effects, 48-49, 86-123 

 After-ripening of seeds, epicotyl: temperature 



effects, 113-123 

 Aging of seeds: causes, 60-63 

 Agrostemma, 36, 38 

 Albizzia, 30, 51 

 AHsma. 86. 90 

 Alisma Plantago, 79, 101 

 Allium, 75 

 Alsine, 36 



Alsophila pometaria: {See Cankerworm) 

 Alternaria solani: comparison of greenhouse and 

 laboratory spore tests of fungicides on to- 

 mato, 378 

 induced sporulation in culture, 377 

 time and temperature effect on germination of 



spores, 372 

 use in greenhouse tests of fungicides on tomato, 

 374-378 

 Amarardhus: 36, 37, 38, 39, 40, 129, 312 



dormancy and water-absorption of seeds, 126 

 Amaranthus retroflexus: 39, 41 



dormancy and germination of seeds, 127-128 

 Amaryllis: pollen storage, 429-430 

 Ambrosia, 35, 36, 37, 45, 46, 47, 84, 85 

 Ambrosia trifida: after-ripening and development of 



secondary dormancy in embryos, 4t>-47 

 Amelanchier , 90 



2-Amino-5-chlorobenzoic acid, 223 

 2-Amino-3,5-diiodobenzoic acid, 223 

 Ammonia effects: on plants and animals, 196-200 

 Amorpha, 72 



Amylase: affected by ethylene chlorohydrin, potas- 

 sium thiocyanate, 250 

 Anagallis, 34 



Analytical methods: capillary glass electrode, 437 

 for ashing plant tissue, 436-437 

 for determination of reducing sugars, 437 

 Anatomical studies of effect of light on plants, 331- 



333 

 Anesthesia: induction by gases, 150-158 

 Anesthetic effects on animals: of ethylene,^155-1.58 

 Anesthetic effects on man: of ethylene, 155-158 

 Anesthetic effects on plants: of growth substances, 



22G 



Anthemis, 36 



Anthocyanin: effect of low temperature on devel- 

 opment, 320-321 

 Antholyza revoluta, 430 

 Anthraceneacetic acid, 207 

 Anthriscus, 43 

 Anthyllis, 30 



Aphis gossypii: transmits lily mosaic, 432 

 Aphis rumicis: nicotine toxicity, 344 

 organic thiocyanates toxicity, 351 

 pyrethrum toxicity, 350-351 

 Apium, 35, 40 

 Apple: arsenic residues from spraying, 355 



red pigment production by artificial light, 320-321 

 Aquilegia, 42 

 Aralia, 90 



Aralia racemosa, 112 

 Arbutus, 90 



Arbutus, trailing: propagation, 433-434 

 Arceuthobium, 75 

 Arceuthobium oxycedri: dormancy and germination 



in seeds, 123 

 Arctium, 35 



Arctostaphylos Uva-ursi, 112 

 Arsenic: determination in sprayed apples, 355 

 sampling method of residue on sprayed apples, 

 439 

 Artificial light: effects on growth of plants, 285-340 

 Asarum, canadense, 113 



Ascorbic acid: carbon dioxide effect on fruits and 

 vegetables, 406—408 

 production in potatoes treated with ethylene 

 chlorohydrin, 252 

 Ash, plant: effect of ultraviolet, 322 

 Ashing plant tissue: analytical methods, 436-437 

 Asimina, 90 

 Aspergillus niger: value in determining potash de. 



ficiency in soils, 428 

 Aspidium filix-mas: as an insecticide, 354 

 Aster yellows: studies, 10-12 



symptoms, 11 

 Astragalus, 29, 30, 51 

 Attalea, 33 



Auxin: (See Growth substances) 

 Avena: 39, 205, 206 



cellulose in coleoptile epidermis, 270-273 

 Avena coleoptile: test object fur growth promoting 



substances, 206 

 Azalea nudiflora: 244 



shortening rest period, 245 



Ballota, 43 



Belamcanda, 90 



Benzoic acid derivatives: growth substance activity 



as affected by their str\icture, 223 

 Benzoin, 90 

 Beta, 35 

 Betula, 90 

 Boea, 33 

 Boehmeria, 35 



Bordeaux mixture: effects on spore germination. 

 366-368 



fungus spores solubilize copper, 368-369 



weathering, 368-369 

 Botrychium lariceolatum, 122 



449 



