index. 
Aurora Borealis , an attempt to account for the irregular va; 
nation of the horizontal magnetic needle at the time of 
one — Page 399 
Azores ijlands , many marks of fubterraneous fires near them 
- - • 578 
, fubjed to frequent earthquakes — ibid, 
B 
Baker (Mr. H.) his account of a ftony concretion taken 
* from the colon of an horle — — 694. 
Barker ( Thomas ) Efq; his remarks on the mutations of 
the ftars — — — 49 & 
Baib, account of a meteor feen there Obloberzo, 1759, 301 
Beccaria (Father) his experiments in eledricity — 514 
Bees (a kind of) account of a fpecimen of their labour, 844 
Bergman { Mr. Thorbern) his letter concerning eledricity, 907 
Beririgs ijland , fituation and defcnption of it 1 4-88 
Bevis (John) M. B. his account of the comet feen in May 
1759 — 93 
Birch (Rev. Thomas) D. D. letter to him, containing ex- 
periments on ieveral pieces of marble ftained — 30 
Bird, delcription of one fuppofed to be bred between a 
turkey and pheafant — — — 839 
Blake (Francis ) Efq; on the greateft effed of engines with 
uniformly accelerated motions 1 
Body [human ) concerning the eledricity of it • 340 
Bone found in the pelvis of a man, account thereof 660 
Borlafe (Rev. William) M. A. his account of antiquities 
found in Cornwall ■ — — 1 3 
Bovey toal , remarks thereon — — — 534 
analyfis thereof — — — 55 2 
further account of fome experiments made 
thereon ' — . 94 1 
Brady ( Terence ) M. D. his account of a bone found in the 
pelvis of a man — — 660 
Brakenridge (Rev. William ) D. D. his letter concerning the 
fedionsof a folid not hitherto confider’d by geometers, 445 
Broken arm, remarkable operation thereon 65 7 
Cam- 
