CONT E N T S 
O F 
VOL. LXXI. 
P A R T 
XV. frill IV Experiments upon Gun-powder, with oecofionai 
^ Obfervations and practical Inferences io which are 
added , , an Account of a new Method of determining the Velo- 
cities of all Kinds of Military Projectiles, and the Defcrip- 
tion of a very accurate Eprouveite for Gun-powder, By 
Benjamin Thompfon, Efq , F. R. S. ' Page 230 
XVI. Account of a luminous Appearance in the Heavens. By 
Mr, Tiberius Cavallo, F. R. S. in a Letter to Sir Tofeph 
Banks, Bart . P. R. S. p fg 
XVII. Account of an Earthquake at Hafodunos near Denbigh. 
By John Lloyd, Efq. F\ R. S. in a Letter to Sir Joleph 
Banks, Bart . P. X; S. p. V, j 
XVIII. On the Heat of the Water in the Gulf f ream . By Charles 
Blagderi, M. D -. Phyjictan to the Army, F. R. S a p. 334 
XIX. Account of the Appearance of the Soil at opening a Well at 
Hanby in Lincolnfhire. In a Letter from Sir Henry C. 
Englefield, Bart. F. R. and A . S ; to Sir joleph Banks, 
Bart. P. R, S. p # ^ - 
XX. Agronomical Obfervations made by Nathaniel Pigott, Ejq. 
Ft R. S. Foreign Member of the Academies of Brufiels and 
Caen, and Correfpondent of the Academy of Sciences at Paris. 
Communicated by Sir Henry C. Englefield, Bart . F. R. 
and A. S p. 243 
XXI. Abfraci of a Regifer of the Barometer , ‘Thermometer , 
and Rain , at Lyndon, in Rutland, 1780/ By Thomas 
Barker, Efq s D . 35I 
XXII. 
