INDKX. 383 



Selenium from Anglesea, pyrites, analysis of, 151, 152 



Ships of Wary observations on the distribution and changes of the 

 magnetic intensity in, 333«335 ; improvements in the con- 

 struction of, 335, 336 



Silica^ geological account of, and its uses, 80, 81 



Silvery experiments on a compound of cyanuret with the nitrate 

 of, 159, IGl 



Smoke of furnaces, &c., method of consuming, 138, 139 



Snow (red) of the Alps, observations on, 166, 167 



Snow Stornii luminous, account of, 366 



Soundy experiments on the velocity of, 108 



Speechy observations on the physiology of, 8-16 



jS/ar^, catalogue of, in the comet of Encke, 119, 120; a falling 

 star seen at mid-day, 369 



Steam engines at Glasgow, number and horse power, 328 



Steely experiments on the elasticity and strength of hard and soft, 

 104-107 



Straker TMr. J.) new method of embossing on wood by, 134, 135 



Strata ot the earth, geological account of, 83-96 



-S/ron^m, separation of, from Baryta, 153, 154 



Sulphate of soda, composition of the crystals of, 1 52, 1 53 ; the 

 sulphate and super-sulphate of cinchonia and quinia, how pre- 

 pared, 161-163 



Sulphuric acidy hygrometical indications by, 346 



Sulphurous acid (anhydrous) new production of, 345 



SuHy times of the motion of spots in, 328 



Swainson (William) description of anew species of parrot, 198-200 



TaZfow, vegetable, account of, 179-184 

 Tartar (emetic) of the shops, impurity of, 243 

 TelescopeSy account of M. Guinand's glasses for, 248-258 

 Temperaturcy on the earth's surface, experimental data, respecting 



the, 173 

 Test for iodine, 343 ; for the presence of muriatic, or nitric acids, 



or the salts of these acids, 345 

 Thomson's (Captain) Tablec, examination of 281-287 

 Titaniumy analysis of the chloride of, 156, 157 ; on the discoyery 



of titanium in mica, 157-159 

 TraiU (Dr. T. S.) description by, of the coal recently discovered in 



Mexico, 27, 28 

 TmnsiV-instrument, put up at the Cambridge observatory, account 



of, 268 

 Transitions among rocks, remarks on, 212, 213 

 Transportation of fish, from salt to fresh water, experiments and 



observations on, 235-243 

 Tredgold (Mr. Thos.) experiments of, on the elasticity and strength 



of hard and soft steel, 104-107 



