598 
INDEX. 
General remarks, 384 — Gossamer^ 385 — Shower of 
spider's webs, 387 — Aranea aeronaiitica described, 387 
— Remarks on Aranea geometrica, 388 — ^Atmosphere 
full of cobwebs, 388 — Fall of A. aeronautica after a 
discharge of fire-arms, 389 — Experiment on spiders, 
389 — Propulsion of the thread, 390 — Thread electri- 
fied, 391 — Various experiments and observations on 
the subject, - - - 392 
Spiralepis, generic characters of, - - 551 
Splachnoidese, characters of the family of, - - 442 
Splachnum, generic characters of, - - 448 
Sponges, Dr Grant's memoir on the natural history of, - 574 
Stone-axe, account of one said to have been found imbed- 
ded in compact clay under limestone, , - 567 
Tallow- candles, Dr Yule*s account of the changes pro- 
Thermometrical observations made hourly at Leith, during 
twenty-four successive hours, and once every month, 
from July 1822 to July 1823, Mr John Coldstream's, - 175 
Toad imprisoned for fifty-four years, Major-General Hard- 
Traill, Dr Thomas Stewart, his observations on the habits, 
appearance and structure of the Psophia crepitans, - 523 
Trap Rocks of the counties of York, Durham, Westmore- 
land, Cumberland, and Northumberland, Mr Witham's 
notice regarding the, 475 — Opinions respecting the 
origin of trap, 475— Strata of Derbyshire, 476 — De- 
scription of the trap rocks in question, - 477 
Tritonia arborescens, Dr Grant's observations on its habits, 578 
Trumpeter, Dr Traill's observations on its habits, appear- 
ance and structure, > . » 523 
Turpentine, rectified oil of, Dr Traill's communication re- 
garding its use fur preserving zoological specimens, - 578 
T 
duced in, 
Tayloria, characters of the genus. 
- 567 
- 470 
wick's account of one, 
Tortula cirrhata described. 
- 571 
- 201 
