Numb. 40 <£, 
PHILOSOPHICAL 
TRANSACTIONS 
FOR THE 
Month of ‘DECEMBER, 1718. 
The CONTENTS. 
I. Remarks on the Height of Mountains in general, 
and ofthofe of Swifferland in particular, with an 
Jccount of the Rife of fome of the mofl conjide- 
rable fevers of Europe. By J. G. Scheuchzer, 
M. 1 ). See. 
II. Optical Experiments made in the Beginning of 
Auguft 172.8, before the Brefident and federal 
Members of the (Royal Society, and other Gentle- 
men of feVeral Nations, upon Occafion of Signior 
Rizzetti’r Op ticks, with an Account of the J aid 
Book, By J. T. Defaguliers, L L. t>. and 
F. % S. 
a % 
III. The 
