CONTE N TS 
O F 
VOL. LXXIX. Part I. 
I. 7 ~\ E SCR IP T ION of an Improvement in the Application of 
the Quadrant of Altitude to a celejlial Globe , for the 
Refolution of Problems dependant on Azimuth and Altitude. 
By Mr. John Smeaton, F. R . S . ; communicated by Mr # 
William Wales, F. R. S. Page i 
II. Objections to the Experiments and Obfervations relating to the . 
Principle of Acidity , the Compoftion of Water, and Phlo - 
gif on, confidered ; with farther Experiments and Obfervations 
on the fame Subject . By the Rev. Jofeph Prieftley, LL.D. 
F. R. S. 
P- 7 
III. Obfervations on the Clafs of Animals called, by Linnaeus, 
Amphibia ; particularly on the Means of df inguifhing thofe 
Serpents which are venomous from thofe which are not Jo. 
By Edward Whitaker Gray, M. D. F. R . S. p. 21 
IV. Obfervations on the Drynefs of the Tear 1788. In a Letter 
from the Rev . Mr. B. Hutchinfon to Sir Jofeph Banks, 
Bart. P . R. S. P* 37 
V. On 
3 
