SUBJECT INDEX 



A (see Intercellular pressure), 107 

 Absorption, forces involved, 138 

 Absorption of water, 148-154 



active, 149-151 



at permanent wilting, 152 



"induced," 138 



passive, 151 



"primary," 138 

 Accumulation, solute, 79, 126, 138 



water (see Active water relations) 

 Acer, gas in stem of, 161 

 Acid-arsenical method, of weed control, 157 

 "Activated diffusion," theory of translocation, 



174 

 "Active pressure," 129 

 Active water relations, 111-147 



diffusion pressure deficits and, 131-132 



evidence from animal physiology, 136-138 



evidence from frost and drought resistance, 

 132-136 



mechanisms proposed for, 141-146 



solute accumulation, relation to, 138-139 

 Active water uptake, auxin and, 127-131 

 Activity, defn., 41, 77 



freezing pt. detn. of, 93 

 Adhesion, cytoplasm to wall, 83-85, 114-115 



water movement and, 154-155 

 Aesculus, gas in stem of, 161 

 Alfalfa, 2,4-D movement in, 177 

 Algae, osmotic detns., 85, 127 



vacuolar sap of, 70 



vacuolization in, 68 

 Alkalinity, effect on growth, 148 

 Alliaria officinalis, water continuity in, 163 

 Allium (see also Onion), photosyn. and sug. 



cone, 201 

 Alnus, gas in stem of, 161 

 Aloe, expressed sap of, 119 

 Amino acids, protein constituents, 66 



in protein synthesis, 129 

 Ammonia, thermal properties of, 4 

 Ammonium thiocyanate, translocation of, 157 

 Amylase, hydrolytic activity of, 200, 202, 203 

 Anaphoresis, 141 



Anatomy, root structure and absorption, 149 

 Anguilla vulgaris, water regulation in, 137 

 Animal physiology, evidence for active water 



relations, 136-138 

 Anion accumulation, 139 

 Anomalous osmosis, 141, 142, 143 

 Anomalous plasmolytic behavior, 124 

 Anthocyanin, as indicator of cell injury, 84, 



118, 125 

 Apple, water content of fruit, 62 

 Aquatic animals, osmoregulatory processes in, 



136 

 Arsenic, weed control and, 157 

 Arthrophytum hatoxylon, DPD of, 166 



DP gradient in, 164, 165 



transpiration of, 165 

 Ash tree, gas in, 157 

 Association factor, of water, 37 

 Atmospheric moisture, relative humidity, 56 



vapor pressure, 56 



DPD of, 56 

 Atmospheric pressure, DPD base line, 48 



and sap rise, 156 



effect on evaporation, 181-182 

 Atoms, forces between, 20 

 Atriplex confertifolia, OP sap of, 99 

 Auxin, active water relations and, 127-131 



effect on cell, 140 



effect on exudation, 150 



effect on respiration, 124 



translocation of, 175 



Barger-Halket method, OP by, 96 

 Barley, water content of, 62 

 Bean, water content of, 62 



2,4-D movement in, 177 



water absorption by, 153 

 Beet (see Beta) 



Begonia rex, plas.-cryos. discrepancy in, 112 

 Bellis perennis, DPD of, 106 

 Benzene, phys. properties of, 4 



stomatal detns. with, 197 



wettability of cell wall by, 193 

 Berberis nervosa, internal leaf surface in, 195 

 Bergenia cordifolia, adhesion pressure, 83 



OP values of, 114-115 

 Beta vulgaris, adhesion in, 84 



flower stimulation in, 176 



freezing pt. of sap of, 112, 115, 116, 118, 

 120, 126, 134 



plas.-cryosc. discrep. in, 112, 115, 118 



plastic stretching of walls, 84 

 Bioelectric forces, in plant cells, 144 

 Birch, rate of sap flow in, 171 

 Blood, thermoelectric detn. of rate of movement, 



170 

 Bombardment theory, of OP, 33 

 Bonds (see also Forces), and hydration, 29 



hydrogen, 22, 29 



ionic, 22, 29 

 Boraginaceae, colloids in vacuoles of, 69 

 Bordeaux spray, effect on transpiration, 199 

 Bound water, 24-26 



calorimetric method for, 121, 122 ' 



definitions of, 24 



frost resistance and, 135 

 Boundary layer, evaporation and, 183 

 Boyle's law, 32 

 Brassica napobrassica, plas.-cryos. discrepancy, 



112 

 Brassica sinapis, wettability of cuticle, 187 

 Bryophyllum calicynum, internal leaf surface of, 



195 

 Buckeye, gas in stem, 159 

 Butyl alcohol, leaf penetration by, 193 

 Buxus sempervirens, expressed sap of, 120 



Cabbage, water content of, 62 

 Caladium bicolcrr, plas.-cryos. discrepancy, 112 

 Calcium, salt effect on leaves, 198 

 Calcium chloride, electroosmosis and, 131, 144 

 moisture detn. with, 186 

 plasmolyzing agent, 83 

 water requirement and, 198 

 Calcium ferrocyanide, OP of solutions, 38, 39 

 Callithamnion roseum, cell walls of, 85 

 Calorimetric method, 121, 122 

 Cambium, OP of, 100 



water movement and activity of, 154, 156 

 Camphora officinalis, air space in leaves of, 194 

 Capillarity, and liquid in xylem, 162 

 Capillary force, and injection into xylem, 157 

 Capillary tubes, in OP detns., 96, 97 

 Carbohydrates, translocation of, 175 

 Carbon: nitrogen ratio, in phloem exudate, 175 

 Carbon dioxide, physical properties, 4 

 Carbon disulfide, physical properties, 4 

 Carbon tetrachloride, physical properties, 4 

 Carrot, water content of, 62 

 Castor bean, gas in stem of, 159 

 Castor oil, in infiltration method, 197 

 Catalase activity, water deficit and, 200 

 Catalpa, protoplasmic volume in, 135 

 Catalpa speciosa, internal leaf surface of, 195 

 Cell method for diffusion pressure deficit, 102- 



103 

 Cell sap, (see also Sap) cryoscopic value of en- 

 tire, 118 



