INDEX. 
4U 
Sea-snake of the Aleutians described, 188. 
Sea-water, on the specific gravity of, l6l. 
Shetland Islands, extracts from Dr Hibbert’s description of the, 240. 
Shumachers Professor, his new Astronomical Journal, 175. 
Silliman, Professor, on natural Icehouses, 353. 
Siher-we, red, analysis of, 17* ^ 
Sivright, Mr, on the use of agalmatolite for pyrometers, 1 80. 
Slide of Alpnach described, 338. 
Smoke, method of consuming, 297* 
Snow, red, found in South Shetland, 189. 
Sodalite, analysis of, 13. 
Specific gravities of several bodies, 390. 
Spina ge, on the ancient history of, 127- 
Starch, new method of making it, 303. 
Stauhbach, account of barometrical observations made at the Fall of 
the, 224. 
Steam-boats, method of propelling them, by Mr Gladstone, 295. — by 
Mr Phillips, 302. — by Messrs Reedhead and Parry, 302. 
Steam-engine, account of Ward’s alternating one, 303. — Mr Stein’s im- 
provements on the, 308. 
Steel, how to protect it from rust, 298, 
Stein, Mr, his improvements on the steam-engine, 305. 
Stenness, account of the Isle of^ 247. 
Stilbite, observations on, by Mr Brooke, 121. 
Storm of rain at Catskill, 382. — salt storm in N. America, 383. 
String alphabet for the use of the blind, 1 95. 
Strom M. his analysis of Wernerine, 1 8. 
Strontianite, analysis of, 393. 
Sulphato-lri-carbonate of lead, on a new variety of, 183. 
Sulphurets, alkaline, Berzelius’s experiments on the, 1. 
Swinden, M. Van, on the history of the invention of pendulum-clocks. 
Table of the dimensions of an aplanatic double object-glass, by Mr 
Herschel, 367. 
of the distribution of vegetable forms, 288. 
Tantalum, observations on, l6. 
Teinoscope, description of the, for altering the lineal proportions of 
objects, 334. 
Teutonic fortress described, 251, 
Thermal springs of Yom-Mack described by Mr Livingstone, 156. 
Titanic acid, 15. 
Titanium, on the oxide of, ib. 
Tourmaline, on a remarkable instance of dichroism in, 177. 
Traill, Dr, his observations during the eclipse of the sun of the 7th 
September 1820, I67 — on the spurs of the ornithorynchus, 184. 
Trees of Sumatra and Malacca, 398. 
Tritomia media, observations on the, I89. 
Troy pound, on the Dutch, 400. 
Turnip, on the ancient history of the, 26l. 
