INDEX 



Abbott, J. B., Connor, S. D., and 



Smaller, H. E., cited, 157. 

 Abnormal Shedding of Yonng Fruits 

 of the Washington Navel Orange, 

 An Investigation of, 283; loca- 

 tion of experiments, 285; condi- 

 tions: climate, soil, water, char- 

 acter of cultivation, 285-288; 

 nature of June drop, 288-291; 

 possible causes of abscission, 29'2- 

 306 (see Abscission; Alternaria 

 citri); influence of the environ- 

 mental complex, 307-321, and 

 methods of ameliorating, 329-331; 

 factors contributing to water re- 

 lation strains, 321-328; summary 

 of results of the investigation, 

 332-333. See also Abscission; 

 Alternaria citri; Washington 

 Navel orange. 

 Abnormal Water Relations, Some, in 

 Citrus Trees of the Arid South- 

 west, and Their Possible Signifi- 

 cance, 37. 

 Abscission, studies in nature of, 290, 

 291; description of histology of, 

 in Citrus, 290-291; stimuli lead- 

 ing to, 291-306; traumatic stim- 

 uli (mechanical shock), 291-292; 

 air temperatures and light 

 changes, 292-293; lack of pollina- 

 tion and fertilization, 293-294; 

 relative position on stem, 294; 

 the gas factor, 294-297; fungi 

 and bacteria as a cause of, 297- 

 306; relation of, to environmental 

 complex, 307-321; factors opera- 

 tive in causing water relation 

 strains, 321-328; citrus varieties 

 susceptible to, 328-329; methods 

 of amelioration, 329-331; illus- 

 trations of fruits, opp. 344, 346, 

 352, 354, 358, 362. See also Ab- 

 normal Water Relations in Citrus 

 Trees. 

 Absorption, studies in, 138-139, 140, 



143, 148; by colloids, 272. 

 Aeration, factor conditioning absorp- 

 tion, 322-324. 

 Africa, South, Phalaris bulbosa from, 



2. 

 Ageton, C. N., and Giles, P. L., cited, 



140. 

 Air temperature, effect of, on ab- 

 scission in Washington Navel 

 orange, 292. 

 Alfalfa, influence on water relations 

 in Citrus, 316, 318, 329. 



Altamont soil type, study of, 378, 

 498. 



Alternaria, genus, 299, 300. 



citri, cause of black rot disease in 

 Navel oranges, 297-306; descrip- 

 tion of infection, 298, 304-305; 

 theory regarding stimulus to ab- 

 scission, 298-299, 305-306; prob- 

 lem of identification of, 299-300; 

 futility of use of fungicides 

 against, 331; illustrations of in- 

 fected fruits, opp. 354,360; photo- 

 micrograph showing spores of, 

 opp. 356. 

 solan i, 300. 

 tenuis, 300. 



Aluminum chloride, 138, 149, 156, LV7, 

 158, 164, 186-191. 



Aluminum nitrate, 157. 



Alwood, W. B., cited, 116. 126. 



Ammonia, used in experiments on 

 soil, 29, 271, 272. 



Ammonification of soil field samples, 

 472. 



Ammonium sulphate, 272. 



Animal physiology, effects of salts 

 on, 64, 83, 87, 89, 90, 94, 96, 136. 



Antagonism, in plant and animal 

 physiology, 83, 84, 86, 87, 89, 90, 

 92,' 94, 95, 96, 136, 138-140. Si 

 also Salts, toxic and antagonistic 

 effects of. 



Antagonism and Cell Permeability, 

 The Chemical Composition of the 

 Plant as Further Proof of Close 

 Relation between, 135; phases of 

 the problem, 137; review of other 

 investigations, 137-140; methods, 

 140-144; solution used. 142; ex- 

 perimental data, 144-154, 155; ex- 

 ternal appearances of the plants, 

 154-155; results with salts of the 

 heavy metals, 156; effect on 

 plants of variation in solutions, 

 160; possible calcium-magnesium 

 ratio, 160-162; permeability and 

 antagonism, 162-165; summary, 

 165-166. 

 Tables and graphs: Calcium chlor- 

 ide, 168, 169, 170. 171, 172, 173, 

 174, 17.-.. 17s. 179, 188, 1-'.'. L94, 

 195; magnesium chloride, 170, 

 171, 172, 173, 174. 175, 190, 191, 

 196, 197; magnesium sulphate, 

 176, 177. L78, L79, 180, L81, 184, 

 L85; calcium nitrate. 180, 181; 



potassium chloride, 182, 183, 184, 

 185; aluminum chloride, 186, l s 7. 



[499] 



