684 



SUBJECT INDEX 



Cyclosis, see protoplasmic streaming 

 Cystine, 420, 442 

 Cytases, see hemicellulases 

 Cytochrome, 535, 546 

 Cytoplasm, 

 'pH of, 80 



physical properties of, 73"76 



structure of, 76-77 

 Cj^toplasmic membranes, 11 8-1 19 



permeability of, 1 19-126, 406-407 



Dalton's law, 9 

 Dark reaction, 329, 330 

 Deficiency of mineral elements, symp- 

 toms of, 427, 428-429, 430 

 Dehydrogenases, 534-535. 545 

 Dendrograph, 240 

 Denitrification, 456-457 

 Density of gases, relative, 89 

 Desiccation of cells, 301-302, 591, 



594 

 Dextrins, 377, 378 

 Diastase, 185, 377, 468-469, 479 

 Diffusion, 84-86 



gradients of, 90, 150, 193, 199, 

 203-204, 235, 277, 279 

 Diffusion of colloidal particles, 40 

 Diffusion of gases, 84-86 



factors influencing, 89-91 



through multiperforate septa, 181- 



183, 344-345 

 through small pores, 1 79-181 

 through stomates, 158, 178-183, 

 203-204, 320, 510 

 Diffusion of solutes, 91 

 factors influencing, 91 

 in gels, 55 

 Diffusion pressure of gases, 86-88 

 Diffusion pressure of water, 96, 97, 



107, III 

 Diffusion pressure deficit 



of cells, 145-153, 186, 234-236, 



241, 277-278, 293, 295, 557 

 of imbibants, 151 

 of soil water, 259-262, 277, 278, 



283 

 of water, 97 



Diffusion pressure deficit — Continued 



relation to tension, 149, 234, 235, 

 278 



relation to vapor pressure, 207 

 Diffusion shell, 181 

 Digestion, 324, 461, 468-472, 478- 



479, 570, 627 

 Dipeptides, 438, 443, 447 

 Disaccharides, 369, 373-374 

 Dissociation of electrolytes, 12-13 

 Dormancy of buds, 637-638 



methods of breaking, 638-641 

 Dormancy of seeds, 626, 631-634 



methods of breaking, 634-636 



secondary, 634 

 Drought resistance, 298-302 

 Dynamic equilibrium, 12, 28, 45, 85, 

 145-146, 150, 160 



Elaioplasts, 78, 397 

 Elasticity, 



of cell walls, 68 



of cytoplasm, 73 

 Electrical adsorption, 29 

 Electrical charge, 



on colloidal particles, 44-48 



on cytoplasm, 75 

 Electrical conductivity, 



in gels, 55 



of cytoplasm, 75 

 Electrical potentials in plants, 578, 623 

 Electric double layer, 45-46, 104, 



113-114 

 Electrolysis, 1 1 

 Electrolytes, 11-13 



accumulation by plant cells, 407- 



411 

 dissociation of, 12-13 

 osmotic pressure of, lOO, 102 

 permeability of cytoplasmic mem- 

 branes to, 121, 406-407 

 Electrolytes, effect of, 



in flocculating sols, 49-52 



on hydration of colloids, 112-114, 



416 

 on imbibition, 112-114 

 on permeability, 123-125, 416 



