60i 



INDEX. 



Temperature of earth and air, at Chis- 

 wick, 128 



of earth and air, results 



deduced from tables, 124 



of earth, in and near the 



tropics, always warmer 

 than the air, 131 



: of earth, in various parts 



oftheworld, 117, 125 



■ of earth, reason why it is 



necessary to be higher 

 than that of air, 148 



of Boils, its important in- 

 fluence on vegetation, 149 



of soils, relation it bears to 



that of the air, 130 



of springs, unsatisfactory 



as indicating that of the 

 earth, 117 



of tropical seasons, 132 



sudden changes in, inju- 

 rious to plants, 435 



Mr. Thompson's tables on, 



117 



very low, under the in- 

 fluence of light causes 

 the early appearance of 

 fruit, 612 



which grain will bear, 248 



with regard to the direc- 

 tion of the wind, 190 



Thawing plants that are frozen, 112 



Thumb-pots, the best adapted for first 

 potting of cuttings, 299 



Thuret, M., experiments on the spores of 

 seaweeds, 10 



Timber, annual rate of growth in oak, 415 



its composition, 413 



pruning for, 395 



refutation of the fallacy that slow- 



grown is superior to fast-grown, 



412 

 Tissue, cellular, is the component of the 



first rudiments of the stem, 



84 

 contracts imder the influence of 



cold, 187 



disorganisation of, 168 



fibro-vascular, 413 



■ forming veins has a double origin, 



56 



general distention of, in roots 



growing in air and water, 21 

 general distention of, in the em- 

 bryo state of roots, 17 

 its first formation requires nitro- 

 gen, 28 



its hygrometrical force depends 



on the action of the vital prin- 

 ciple, 27 



Tissue, live, cannot form an organic union 

 with that which is dead, 405 



mixed arrangement of, in endo- 



geus, 35 



reproduction of, upon a decorti- 

 cated space, 36 



Tongueing, 301 



its use, 315 



Training, 



421 



diseases induced by, 429 



downward, advantageous, 424 



its disadvantages, 428 



= its effects on the circulation of 



the juices, 429 



objects to be attended to, 424 



Transformation of the parts of plants, 



82,92 

 Transplanted trees, importance of pre- 

 serving the roots of, 

 455 



languid from previous 



dryness, efiects on, 

 by the too rapid 

 absorption of water, 

 462 



their pruning often 



injurious, 366 

 Transplanting, 445 



— eSects of, on annuals, 467 



facts relating to, 459 



in spring, objectionable, 



450 



its rationale, 446 



leads to the production of 



flowers and fruit, 94 



manner of performing the 



operation, 456 



of deciduous trees, 446 



of evergreens, 450" 



preparation of old trees 



for, 457 



why autumn is 



— reasons 



the best season for ever- 

 gi-eens, 453 



seasons for, 447 



very large trees, 458 



Trdcul, M., his explanation of the de- 

 velopment of leaves, 65 



Tree-ivy, origin of, 481 

 Trees and shrubs, are renovated annually, 

 472 



' distinct parts of their 



bark, 39 



Chinese mode of dwarfing, 368 



hard-wooded and resinous, modes 



of grafting, 321 



inscription on, remarkable instance 



of, 38 



instance of being decorticated by 



lightning, 47 



