INDEX. 307 



Salt : more universally diffused than any other matter, i. 134 



spectrum analysis of the rarefied vapour of, i. 141 

 Sand of the sea-shore, the debris of quartz rocks, i. 17 

 Sandal wood, amount of radiant heat absorbed by the perfume of, i. 44 

 Sandhopper, structure of the, ii. 201, 202 

 Sap milk, composition and formation of, i. 425 

 Sapindacese, or soapworts, fruits of, innocuous, i. 426 

 Sapphire, i. 4 



Sapphirina fulgens, structure and habitat of, ii. 204, 205 

 Sarcode, structure and functions of, ii. 2 

 Sarcophycus of the Antarctic Ocean, i. 256 

 Sarcophycus potatorum, fruit of, i. 256 

 Sargassum, habitat of the, i. 255 



Sargassum bacciferum, structure, fructification, and habitat of, i. 257 

 Sargassum vulgare, structure, fruit, and habitat of, L 257 

 Saturn, the planet, spectrum of, i. 158, 161 

 Sausages, fatal effects caused by, i. 285 

 Saw-dust, manufacture of into oxalic acid, i. 116, 117 

 Scalariae, tongues of, ii. 239 

 Scallop, or pecten, eyes of the, ii. 235 

 Schistocarpi, characters of the group, i. 328 

 Schistostegei, structure and habitat of, i. 331 

 Schizsea, structure of, i. 363 

 Schizaeineae, characters of the, i. 363 



sporangia of, i. 343 



characters of the group, i. 345 

 Sclerogen, i. 175 



production of, in plants, i. 421 

 Scolopendrieae, characters of, i. 351, 352 



Scolopendrium, structure and development of the caudex of, i. 340 

 Scolopendrium vulgare, or Hart's -tongue fern, structure, fructification, 



and habitat of, L 351, 352 

 Screw pine, roots and habitat of, i. 387 

 Scutella, spines of the, ii. 180 

 Scutula, organs of reproduction of, i. 307 

 Sea-cucumbers, structure and mode of reproduction of, ii. 183 

 Sea-eggs, or sea-urchins, structure of, ii. 176 et seq. 

 Sea-fans, structure of the, ii. 125 

 Sea-mat, structure of, ii. 218 

 Sea-nettles, vast shoals of, ii. 100, 101 

 Sea-pens, structure of, ii. 128, 129-131 

 Sea-salt, chlorine obtained from, i. 18 



X 2 



