XI 
CONTENTS. 
made by Mr. Short : By the late Thomas Heberden, 
M.D. F. R. S. p. 502 
XLII. Account of the Franft of Mercury, obferved at 
Norriton, in Penfylvania Nov. 9, 1769, agreeable 
to an Appointment of the American Philofophical 
Society , held at Philadelphia, for promoting ufeful 
Knowledge: By William Smith, D.D. Provof of the 
College op Philadelphia; John Lukens, Efq-, Surveyor 
General of the Province of Penfylvania; David 
Rittenhoufe, A. M. and Mr. Owen Biddle. Com - 
municated by Benjamin Franklin, LL. D. F. R. S. 
and Prefdent of the Philofophical Society at Phila- 
delphia. p. 504 
XLIII. A Letter to James Weft, Efq -, Prefdent of 
the Royal Society , containing the Invefigatiom of 
twenty Cafes of Compound Intercf : By J. Robert- 
fon, Lib. R . S. p. 508 
XLIV. A Copy of a Letter from John Ellis, Efq-, 
F. R. S. to Dr. Linnaeus, F. R. S. &c. with the 
Figure and Characters of that elegant American 
Evergreen-tree , called by the Gardeners , the Lob- 
lolly Bay, taken from Bloffoms blown near London, 
and Jhewing that it is not an Hibifcus, as Mr. 
Millar calls it-, nor an Hypericum, as Dr. 
Linnaeus fuppofes it, but an intire news Genus, to 
which Mr. Ellis gives the Name of Gordonia. 
p- j i8 
XLV. The Copy of a Letter from John Ellis, Efq-, 
F. R . S. to Mr. William Aiton, Gardener to her 
Royal Highnefs the Princefs Dowager of Wales, at 
Kew, on a new Species of Illicium Linnaei, or 
Starry Anifeed Free , lately df covered in Weft 
Florida. p. 524 
b 2 XLVI. An 
