INDEX. 303 



Page. 



Poisonous gases, 127, 128, 129 



Pollen of the flower, 46, 47 



Porphyry, hardness of, .......... 76 



Potato, the wild, 56 



Potato, mode of raising the, . . . . .-.. . 177, 178, 179, 213 



Potash in ashes, . . 15, 62 



Potash plants, 66 



Poultry, profits of, . . . - 242 



Protean substances, . . . . . . . ... . 70 



Pruning, best time for, ........ 221,251,252,253 



Pudding stone rocks, ........... 76 



Purifiers, use of, 122 



Quality of manures, . . . . . . . v . % . . 118 



Quartz, composition of, . . . . . . . . . . 91 



Quicklime, action of, .......... 100 



Radiation of heat, . . . . . . . . .19,31 



Rain, cause of, . . . . 37, 38 



Raspberry, cultivation of the, . * ., 252 



Reaper, use of the, . . . . . .... . . . 212 



Remedy for exhaustion, 97 



Rennet, preparation of, .......... 263 



Richest soils contain all ingredients, . i. . . 84 



Rocks, decomposition of, .__ .; . . - . . 124 



Rockweed as a manure, . ...... . . . . . 110 



Roller, use of the, . . . . . .... 145, 146, 155, 170, 192 



Root of the plant, . . . . . . ... . . 44, 157 



Roots, culture of, as preparation of land, 166 



Rotation of manures, 207 



Rotation, principles of, 200, 201 



Rotation, the Norfolk, .......... 206 



Rush family of plants, .....,- 54 



Rye, varieties and uses of, 167, 168, 212, 268 



Sago palm, starch in the, 68 



Salt as a fertilizer, 107,108 



Saltpetre, importance of, in agriculture, 15 



Salts, union with acids, 14, 15, 63 



Sandstone, composition of, 77 



Sandy soils, origin of, 77, 84, 85, 86 



Sap, changes of, 46 



Sowing, time of, 201, 202 



Sea plants, manuring qualities of, 110 



Seed-bed, preparation of the, 156, 157, 192, 199 



