xii CONTENTS. 
Immerfiom of Jupiter’s Fir ft Satellite obferved at the 
fame Place in Pennfylvania : By Charles Mafon 
and Jeremiah Dixon. p. 326. 
XLIV. Extrahl of a Letter from Rome to M. Maty, 
M. D. Sec. R. S. on the extraordinajy Heats ob- 
ferved there this lafl Summer. p. 336. 
XLV. An eafy Method of making a Phofphorus, that 
'will imbibe and emit Lights like the Bolognian Stone, 
with Experiments and Obfervations : By John Can- 
ton, M. A. a?id F. R. S. p. 337. 
XLVI. Afronomical Obfervations made at Swetzin- 
gen, in the Tears 1767 and 1768 ; extracted from 
Jeveral Letters written to Charles Morton, M. D. 
Sec. R. S. and one to the late Earl of Morton. By 
Father Chriftian Mayer, F. R. S. AJlronomer to 
the Elector Palatine. 343 
XL VII. Obfervations of the Tranfit of Venus over the 
Sun , and the Eclipfe of the Sun on June 3, 1769, 
made at the Royal Objervatory. By the Rev. Nevil 
Mafkelyne, B. D. F. R . S. and Aftronomer Royal. 
P-355- 
PHILO- 
