THE 
CONTENTS. 
Page 
A Defcription of the variable microfcope i 
The ufe of the improved folar microfcope vi 
A defcription of the tooth and pinnion microfcope x 
The ufe of the new invented folar microfcope ap¬ 
plied to a new improvement on the pyramidi- 
cal camera obfcura, when illuminated by the 
folar rays ibid. 
The ufe of the new improved microfcope applied 
to the camera obfcura, when illuminated at 
night, by a peculiar lamp contrived for that 
purpofe xiii 
The ufe of the pyramidical camera in defigning 
and taking perfpective views xv 
The double conftructed microfcope xix 
Culpepper’s double microfcope xxii 
Wilfon’s pocket microfcope xxiv 
A fcrole for fixing Wilfon’s pocket microfcope 
and reflecting light to it by a mirror xxvii 
The manner of applying Wilfon’s microfcope to 
the folar apparatus xxviii 
The microfcope for opake objects xxix 
Mr. Ellis’s aquatic microfcope xxxi 
A lingle and double aquatic microfcope xxxii 
The univerfal fingle microfcope xxxiv 
The univerfal double microfcope xxxvili 
A new compendious pocket microfcope xl 
To 
