INDEX SECOND. 



Roots are not elongations of the radicle, 204. 



1 causes of their tapering form, 202. 



circumstances change their natural character, 205. 



animal, may become perennial, 208. 



are the most vital parts of the plant, 209. 



convert oxygen gas into carbonic acid gas, 219. 



- economical uses of, 237. 



yield medicinal agents and dye stuffs, 237. 



- structure of, in dicotyledonous plants, 406. 

 cease to elongate when the apex is destroyed, 408. 



herbaceous, structure of, 431. 



annual, which secrete a milky juice, their structure, 432. 



some have no proper vessels, 433. 



Rubia tinctorum, structure of its stem, 419. 

 Rumphius, a celebrated Botanist, 18. 

 Rush, structure of its stem, 296. 



i. structure of its medullary cells, 297. 



Ruysch, his mode of preparing skeleton leaves, 548. 



S. 



Sambucus nigra, anatomy of its leaf, 576. 

 Sap, is the vegetable chyle, 104. 



its sensible qualities when newly drawn, 107. 



^ ferments when kept, 108. 



sugar extracted from it, 108. 



- experiments on it, 109. 



- chemical constituents of, 115. 



is found in the ascending vessels only, 115. 



Feburier erroneously thought it was found in two states, 1 1 5. 



elementary principles of, 121. 



vessels through which it is raised in trees, 362. 



Sap-vessels vary in number and size in the same stem, 427. 



are all punctured in annual roots, 431. 



Sarment, its character, 253. 



Saussure, M.-de, considers the cuticle a compound body, 600. 



considers the cuticular apertures glands, 607. 



Scales of bulbs possess a distinct vitality, 176. 



can produce new bulbs, 170. 



of gems differ from leaves, 465. 



resemble seed lobes, 465. 



Schubler, Professor, his experiments on calcareous soils, 214. 

 Secretions, enumeration of, 122. 



' principles of, 123. 



Senebier, M. his opinion regarding the structure of cells, 324. 



- detected sap in the spiral vessels, 365. 



Severinus, M.A. 6rst taught the art of making skeleton leaves, 548. 



Silicious earths, their effects in soils, 214. 



Smithy Sir E. J. thinks plants are sentient beings, 43. 



his opinions regarding fibrils, 129- 



i accords with the opinion of the ancients respecting the pith, 



374. 



Soils, general remarks on, 210. 

 general components of, 213. 



are hot and cold, 221. 



fertility of, 222. 



