IXDEX. 305 



Reed, cordiceps on the ergot of the, i. 293 



Reed, Italian, vegetable tissues represented in, i. 175, 176 



Reef-building corals, ii. 1 58-142 



Reefs, barrier, formation of, ii. 143 



Resins, formation of, i. 422 



Respiration, chemical powers causing, ii. 4 



Respiration of the muscles, ii. 8 



Reticularia, characters of the order, ii. 24 



Reticularia maxima of cucumber beds, i. 269 



Rhabdonia Coulteri, mode of propagation of, i. 236 



Rhamnus cathartica, M. Charwin's discovery of a green dye obtained 



from the, i. 124 



Rhizocrinus Lofotensis, structure of, ii. 175 

 Rhizopoda, structure of the, ii. 13 



simple Rhizopods, forms of, ii. 22 



Rhizoselenia, enormous masses of, in the Indian Ocean, i. 205 

 Rhizospermse. See Marsileaceae 



Rhizostoma, or many-mouthed medusae, structure and mode of repro- 

 duction of, ii. 97, 98 



food of, ii. 98 



Rhodomelacese, structure &c. of, i. 241 

 Rhodospermese, characters of the, i. 180 



structure and mode of reproduction of, i. 227, et seq. 



causes which affect the form and limits of, i. 243 

 Rhodymenia palmata, structure and mode of reproduction of, i. 236 

 Rhodymeniaceae, structure of, i. 236 



Ricciaceae, or Crystal worts, characters of the order, i. 316 

 Richmond, in Virginia, siliceous deposit upon which it stands, i. 206 

 Riella, characters of the genus, i. 316, 317 

 Rivularia, structure of the genus, i. 213, 215 

 Rivularia nitida, structure and motions of, i. 213, 215 

 Rocella fuciformes, dye and orchil obtained from, i. 303 

 Rocella tinctoria and fusiformis, blue and purple dyes obtained from, 



i. 124 



Rock-crystal, formation of, i. 17 

 Rock-salt, chlorine obtained from, i. 18 



permeable to radiant heat but radiates badly, i. 37 

 Roots, downward tendency of, i. 382 



structure and functions of, i. 409 

 Rosalina ornata, structure of, ii. 41 

 Rosaniline, or roseine, the base of aniline, i. 123 



production of, i. 123 

 VOL. II. X 



