272 
deficient light, 137; need of rest of, 
106; not to be sprinkled in bright 
sunshine, 111; plants, unpacking, 223; 
variability of, 250; washing the roots 
of puddled, 224; watering of potted. 67; 
watering recently-transplanted, 233; 
young, screens for shading, 134, 135. 
Plum, black knot of, 166, 246. 
Plum curculio, 162, 163. 
Plumule, 39. 
Poisons, destroying insects by, 151. 
Pollen, 91; appearance of mature, 254; 
applying, 255; to prevent access of ub- 
desired , 255. 
Pole shears, 248. 
Pollination, 95; in many plants depend- 
ent on wind, 139; planting with refer- 
ence to, 97; to prevent self-, 254; when 
should it be performed, 255, 256. 
Potash, caustic, 155. 
Potassium, 145; assists in assimilation, 
48; -sulfid solution, 171. 
Potato, foliage of, injured by sun heat, 
113. 
Potatoes, knobby, 130. 
Potted plants require drainage, 67; wa- 
tering of, 67. 
Potting and shitting, 229; soil, 230. 
Preparation of plants for replanting, 
224, 
Pricking off seedlings, 738. 
Principle of selection, 16, 249. 
Propagating bed, the, 192. 
Propagation by cuttings, 185; by de- 
tached parts, 177, 182; by division, 
176,177; by division of the crown, 
181; by grafting, 202; by layers, 180; 
by parts intact, 177,178; by sections 
of the plant, 184; by seeds, 176; by 
specialized buds, 182-184; by stolons, 
179; by suckers, 178; methods of, 175. 
Prosenchyma, 49. 
Protective pruning, 246. 
Protoplasm, active state of, 14; dormant 
state of, 14; some properties of, 14. 
Proximal defined, 76. 
Pruning defined, 234; for density, 
240; for flowers or fruit, 2438; for 
growth, 242; for picturesqueness, 239; 
Princtples of Plant Culture. 
for slenderness, 240; for stockiness, 
239; for strength, 240; for symmetry, 
238; formative, 237; implements. 246; 
insufficient, prevents formation of 
fruit-buds, 137; -knife, 246; matura-_ 
tive, 246; objects of, 237; protective, 
246; -saw, 247; season for, 235; -shears, 
248: stimulative, 242; where and how 
to make the cut in, 236. 
Psychrometer, sling, 122. 
Puddled plants, washing roots of, 224; 
Puddled soil defined, 25; prevents ger- 
mination, 26. 
Puddling the roots of trees, 222. 
Pumpkin, provision in, to aid plantlet 
to emerge from seed-case, 32. 
Pyrethrum powder, 153. 
Rabbits, damage from, 148. 
Radicle, 31. 
Raspberry pruning hook, 248, 
Rate of rout growth, 74. 
Reduced vigor, tendencies of, 12. 
Reducing the top of trees prior to plant- 
ing, 224. 
Removing the plant, 221. 
Reproduction defined, 15; relation of to 
growth, 16; sexual and non-sexual, 15. 
Reserve food, 15; how plants use, 61; 
how to promote accumulation of, 88; 
storage of, 60. 
Resin washes, 1595. 
Rest period, 105; not peculiar to tem- 
perate zones, 105; plant processes may 
not entirely cease during, 107. 
Reversion, 250. 
Richards’ transplanting tools, 228. 
Ring-budding, 213, 216. 
Ringing defined, 235; often causes 
formation of flower-buds, 89. 
Ripening of fruits. 100. 
Root and the soil, 62; office of, 62; orig- 
inates in stem, 62; starvation, 60. 
Root branching, conditions affecting, 71. 
Root branching, how stimulated, 71; 
should be encouraged, 70. 
Root cap, 67. 
Root cuttings, 197. 
Root grafting, 207. 
