CONTENTS. 
XIII. The Conftrudion of the logarithmic Lines 
on the GuntcrT Scale j by Mr. John Robert fon, 
F. R. S. p. 96. 
XIV. A Letter f row Mr. John Dollond to Mr. 
James Short, F. R. S. concerning an Improve- 
rnent of r'efraffing Telefcopes. p. 103. 
XV. An Extract from the thermometrical Obferva- 
tions made by Monf DemidofF at Solikamsky on 
the Borders of Siberia, Latit. 59, in the Tear 
1 7 yi > by a Thermometer adapted to Monf. De 
Filler Scale, which , in this Extract, are reduced 
likewife to thofe of Fahrenheit and Monf. Reau- 
mur ; by the Right Hon. George Earl 0/ Maccles- 
field, Pr. R. S. after p. 107. 
XV 7 1. A Comparifon of different thermometrical O 'b- 
fervations in Sibiria, by Mr. W. Watfon, F. R.S. 
p. 108. 
XVII. A Catalogue of the Fifty Plants fromQht\Ea. 
Garden, prejented to the Royal Society, by the 
worfhipful Company of Apothecaries for the Tear 
1772, purfuant to the Direction of Sir Hans 
Sloane, Baronet , Med. Reg. & Soc. Reg. nuptr 
Brxfes, by John Wilmer, M. D. Societat. Phar- 
maceut. Lond. Soc. Hort. Chelf. Brief eld. et 
B reeled. Botanic. p. 1 j o. 
XVIII. Obfer vat ions on a remarkable Coralline, in 
a Letter from Mr. John Ellis to the Rev. Tho. 
Birch, D. D. Sec. R. S. p. 1 1 f . 
XIX. An Account of Jbme uncommon foil'll Bodies, 
by Mr. Henry Baker, F. R. S. p. 117. 
XX. An abftract of a D / fc our fe intit led. The hiftory 
of the emperor Tetri cits, explained and illullrated 
by medals j writen in French by Mr. Claude Gros 
a 2 dc 
