[ 494 3 



e;:tei:nve motion when going to fleep than by external imprefllons In the day-time, 

 ibid. Efiedls produced on a leaf by the burning lens, ibid. And the eleftricai 

 ftack, p. 360. Two other fpecies of this genus mentioned by Linnaeus, ibid. 



B 



Sal'oor.s, the cheapeft method of filliiig them with the Hghteft inflammable air, p. 297. 



Barhadocs^ eife«Ss of the dreadful hurricane there in 1780, p. 334. The aftinia, or a 

 fpecies of animal flower, then Found m confiderable numbers on that coaft, p. 355. 



Barker y rev, Pvobert, B. D. See Stag's Head and Hornt-. 



— Thomas, Efq. See Barometer^ &c» 



Ritromcler, Thermometer, and Rain^ Abftradl: of a Regifter of, at Lyndon, In Rutland, In 

 1784. By Thomas Barker, Efq. Alfo of the Rain at South Lambeth, Surrey j and 

 at Selbourn and Fyfield, Hampfhire, p. 481, 



:Bnfe, account of the Meafurement of a bafe on Hounflow- Heath, by Major-general 

 William Roy, p. 385. Introdudion, ibid. — 390. The author's acknowledgements of the 

 affiftance of feveral fcientific gentlemen, p. 389. 391. 417. 425. Particularly of the 

 worthy Prefident of the Royal Society, p. 425. 458. Choice of the bafe, tab. XVI. 

 p. 390. Firll: tracing of the bafe, and clearing of the ground, tab. XVI. p. 391. Sol- 

 diers preferred to country labourers, and why, ibid. A detachment encamped near 

 Hanworth Sumraer-houfe, ibid. Clearing of the firft feftion of the bafe, p. 392. 

 Tracing of the fecond and third fedions, p. 393, Half the foldiers quartered in the 

 neighbouring villages to clear the third feftion, while the remainder fmoothed the 

 fecond, ibid. Inftrumenrs made ufe of in the firft and fecond meafurements, p. 394. 

 Steel chain, tab. XVII. ibid. Conltruclion of the chain, ibid. Alteration of the 

 chain, p. 39^. Deal rods, tab. XVIII. p. 397, Different opinions concerning the 

 beft method of applying rods in meafurement, p. 398. Meafuring rods and ftandard rod 

 defcribed, p. 399. Brafs flandard fcale, and method of laying off the lengths of the deal 

 rods, p. 401. Major-General Roy's fcale compared with the Society's flandard, p. 402. 

 Manner of afcertaining the length ot the deal rods with it, p. 403 — 405. Chells for 

 holding the deal rods and ftandards, p. 405. Stands for the meafuring rods, tab. 

 XVIII. and XIX. p. 406. Method of drawing a line through the air, parallel to the 

 common fuiface from flation to ftation, in equal dillances of 200 yards or 600 feet, 

 as in the figure at the top of tab. XVIII. p. 407. Nature of the moveable (lands 

 (towards the right-hand in tab. XVIII. and XIX.) explained, p. 408. Plans of the 

 two tables (towards the right-hand in tab. XVIJI.) explained, ibid. Plan of one of 

 the fquare tables (towards the left-hand of tab. XVIII.) with the ends upon the fecond 

 ■and third rods upon it in contadt explained, p. 409. Mr. Smeaton's deal platforms, 

 Handing on pickets drlvtn into the ground, and properly levelled ('tab, XIX.) 

 -<lefcribed, p. 410. Boning telefcope and rods, tab. XVIII. p. 411. IMethod of 

 tracing the line of 200 yards, &c. from one fixed hand to the other, ibid. Boning 



telefcope 



