602 



INDEX. 



Soil, sterile, its effects in accelerating 

 fructification, 93 



temperature of, in autumn most 



favourable for transplanting ever- 

 greens, 453 



temperature important in the ger- 



mination of seeds, 230 



the kinds of, most essential to the 



cultivator, 528 



the manner in which it appears to 



act upon plants, 529 



the most suitable condition of, at 



the period of vegetable rest, 160 



its power of absorbing ammonia 



and its salts, 547 



warm and dry, influences the ex- 



citability and maturity of certain 

 crops, 466 



warmed from being drained, 138 



Solar light, difference of its effects on 



plants when transmitted 

 through different colour- 

 ed media, 300 



effects a decomposition of 



carbonic acid in plants, 60 



■ its effect on leaves, 60 



its influence o: 



life, 60 



occasions the extrication of 



oxygen in plants, 60 

 promotes insensible perspi- 

 ration in plants, 60 

 Solar radiation, 195 



• ~ immense power of, 197 



Solar rays, the immediate cause of per- 

 spiration in plants, 177 



their exhausting effects on 



plants under certain cir- 

 cumstances, 79 

 Solly, Professor Edward, his experiments 

 on the effects of electricEil action on 

 germination, 15 

 Soluble substances as manure, 551 

 Spanish chestnut, instance of the trunk 



of an old tree emitting roots, 22 

 Species and varieties iu their intrinsic 



qualities the same, 476 

 —— continue to propagate without 

 losing their specific peculia- 

 rities, 472 



of plants appear to be eternal, 



471 



the almost impossibility of mu- 



ling, 497 

 Specimen plants, mode of obtaining, 441, 



443 

 Spongelets, act as absorbents, 18 



are not special organs, 19 



carry on the absorption of 



food most energetically, 456 



Spongelets, reason of the extreme points 

 of roots being so called, 18 



their connection with the al- 

 burnum, 18 



their force of absorption, 19 



their nature and consistence, 



18 



Spore of seaweeds, M. Thuref s experi- 

 ments on, 10 



its motion and fertilisation, 11 



Sports, are or may become permanent, 



482 



how continued, 485 



origin of, 481 



Springs, temperature of, imsatisfactory as 

 indicating that of the earth, 

 . 117 

 Stamens, buds formed in the axils of, 54 



their parts and situation, 81 



their use, 95 



Starch, its accumulation in seeds, 243 

 Steam, application of waste, as a medium 



of bottom-heat, 150 

 Stem, bears a variable proportion to the 

 roots, 26 



different forms, 43 



growth by the, 33 



is a branch produced by the first 



leaf-bud, 34 



is at first merely a vegetable cell, 



afterwards increased into cellular 

 tissue, 34 



its horizontal system, 35 



its office, 45 



its origin, 33 



its parts, 35, 42 



its perpendicular system, 35 



• processes by which wounds in them 



are healed, 36 



its properties of forming leaf-buds, 



43 



subterranean, suitable for propaga- 



tion, 282 

 • ■ transmission of sap through, 40 



wounds of, repaired by cellular or 



horizontal system, 35 

 Sterility, 93 



causes of, 239, 369 



from cold, 109 



remedy for, 241, 369 



Stigma, 81, 498 



elective affinity of, 499 



Stock affected by the scion, 357 



and graft, cause of the enlargement 



at their junction, 351 



effect produced by different kinds 



of, 352 



has the effect of inereasing the 



hardiness of a variety that may 

 be worked upon it, 363 



