INDEX. 
South, James, Esq. observations of double and triple stars by. Part 
iii — his catalogue of double stars, iii. 17 — description of his equa- 
torial instrument, iii. 17. 
Southern motion of the stars, supposed, Dr. Brinkley’s remarks on, 
63 — non-existence of, contended for by him, 66. — evidence 
against, from observations of Bradley, Maskelyne, Mudge, 
Lambton, Piazzi, 66, 75. 
Spitsbergen, comparison of barometrical and trigonometrical mea- 
sures of a height in, 290 — chart of the harbour of Fairhaven in, 
290, 291 — measurement of a base in, 291. 
Spunge of platina, its action on gaseous mixtures, 267, et seq — 
how best made and used, 268. 
Stars, spurious disks of, iii. 14 — Faint, singular method of observ- 
ing, iii. 15 — southern circumpolar, Mr. Fallows’s catalogue of 
273 of the principal, 465 — double, triple, and multiple, mea- 
sures of the position, and distance of 380 of the principal, Part 
iii — -fixed, Dr. Brinkley on N. P. D. of the principal, 50. 
Stations for experiments on velocity of sound in Holland, 427 — tri- 
gonometrical measure of their distance, 432. 
Steel, developement of magnetism in, by percussion, 197 — watch- 
maker’s wire has the greatest capacity for magnetism, 200 — 
soft, receives magnetism most readily, 211 — its capacity for mag- 
netism increased by time and by repeated magnetizing, 214. 
comparative elasticity of hard and soft, Tredgold on, 354 — 
cohesion of, 358 — permanent set produced in before breaking, 
357. 
Stockdove never known to breed in England, 32. 
Strata, order of the successiQn of shells in the different, 413, et seq. 
Strength, comparative of hard and soft steel, 354 — numerical esti- 
mate of, 356. 
Strontium, indisposition of to alloy with mercury in the voltaic cir- 
cuit — its electro-mechanical properties, 182. 
Struve, his observations on double stars, Part iii. passim — his ca- 
talogue of double stars, ib. 
Sturgeon , structure of its optic nerves, 227 — cannot see the same 
object with both eyes, 227. 
Swallow caught 100 leagues from land, 13 — Its food, 25 — cause of 
assembling on roofs, 29. 
Swammerdam, excellence of his microscopic observations, 4 — his 
error respecting the eyes of snails, 4. 
Swifts, annual return of to the same nesting place, 16 — feed their 
young with gnats, 21 — early departure of explained, 22. 
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