180 INDEX. 



Sea-serpent, notice of, vi. 163. vli. 68 



Sea-water, on the analysis of, i. 292 



— — — apparatus for raising up from certain depths described, 



V. 227, 23 1. On the use of distilled, 380 

 — — — apparatus for distilling, vi. 147 



• analysis of, viii. 167 



curious effect of, on cast-iron, xii. 407 



experiments on the saline contents of, xiv. 388 



Sea-weeds, observations on the formation and fructification of, vi. 

 211 



Seconds, table of equivalents for converting into space, xiii. 394 ; 

 and into time, 395 



Secretions, on the influence of the nerves on, i. 114. On the in- 

 fluence produced upon the secretion of milk in the ass by taking 

 away the foal, 165 



Secreting power of animals, observations on, ix. 251. xi. 40 



Secret writing, requisites of, x. 89. Of the Spartans, 90. Ob- 

 servations on Lord Bacon's rules for, ib. New system of, pro- 

 posed, with remarks, 91 



remarks on, by means of ciphers, xii. 21. Easy 



and secure method of, 292. xiii. 136. xix. 140 



Seebbck (M.), new experiments of, on electro-magnetic action, 

 XV. 374 



Seed (grain), improvement in, vi. 351 



Seeds, preservation of, xviii. 411 



Seine (river), purification of the water of, xiii. 423 



Selden (Mr.), anecdote of, vii, 261 



Selenium, notice of, xi. 386 



. discovered in the volcanic rocks of the Lipari, xviii. 173 



from Anglesea pyrites, analysis of, xix. 151 



found in the sulphur of the Lipari islands, xx. 174 



Sementini (II Cavalier), observations of, on the use of nitrate of 

 silver in medicine, xii. 189 



Senna, the active principle of, discovered, xi. 398 



Sennaar, account of the country of, xviii. 302 



Sensation, on the laws of, (See Park, Dr. T. R.) 



•^ensation experienced at great altitudes, xv. 386 



