INDEX. 
Collin fan (Mr. Peter J Account of Copper-fprings lately dif- 
covered in Penfylvania, communicated by him — 648 
^ Letter to him concerning a curious flefhy 
Coral-like Subftance — — — 449 
Letter to him concerning the Earthquake 
felt in New York, Nov. 18, 1755 — 443 
Letter to him concerning the Earthquake 
felt in Penfilvania, Nov. 18,. 1755 — 444. 
Letter to him concerning Four unde- 
fcribed Fifhes of Aleppo — — 445^ 
Letter concerning the EfFebts of Light- 
ning at Narking, in Surry — • — 309 
Letter to him concerning fome Micro- 
fcopical Obfervations — — 553; 
Letter to him concerning a Mountain of 
Iron Ore in Sweden — — 30, 
Letter to him concerning the Charr-fifh 
2 10 
Colquhoun (Sir James) his Account of the Agitation of tho- 
W ater at Loch Lommond, AW. 1, 1 755 — 389 
Columbines , Account of that Plant — ■ — 836- 
Comet , Extrabt of a Letter concerning the Return of one in 
the Year 1 757 or 1 758 — • — 347 
Commiffioner s of the Recife, Letter to them concerning the 
Earthquakes along the Coaft of England from Dover to 
4 Margate — — — — 579 
Letter to them concerning the 
Sinking of a River at Pontypool — — 547 
Common Salt , Method of making it fooner,. cheaper, and 
better — — — 330 
Condaminc (Monf. La) his Letter to Dr. Matty — 622 
Configurations of the lmalleft fhining Particles of Snow,. 
Method of obferving them — • — — 644 
Confideratious on Two large Pieces of Lead, with Roman. 
Infcriptipns — — — 686 
Cetfianlifiople, Account , of feveral Earthquakes lately felt 
there » — - — — — 1 1 5 
— — Queries concerning it, and their Anfwers 96 
Copper- 
