[ i6 o ] 
contrary happens in ordinary Vifion, in which the 
Lights and Shades are produced by the different 
Expofure of the Surface of the Body to the inci- 
dent Light. 
3. Small Parts of large Objedts cannot eafily be 
applied to the Microfcope, without being divided 
from theirWholes, which in the Cafe ofVivi fedtion 
defeats the Experiment, the Part dying, and no 
more Motion being oblerved therein. 
4. The Focus in the 'Dioptric Microfcope being 
fo very Ihort, is exceeding nice, the leaft Deviation 
from it rendring Vifion turbid ; therefore a very 
fmall Part of an Irregular Objed can be feen di- 
ftindtly this way. 
To remedy thefe Defedts I have contrived a Mi- 
crofcope on the Model of the Newtonian Tele- 
fcope, in which I have been greatly affifted by that 
excellent Workman, Mr. Scarlet , jitn. I fhall 
fay nothing of the Effedts of this Inftrument, ex- 
cepting that it magnifies from the Diftance of 9 to 
24 Inches, having the Honour of fhewing this In- 
ftrument to this learned Society. 
Explanation of the Figures. 
Fig. 1. The entire Microfcope mounted on its 
Pedeftal, on a proper Joint, contrived fo as to di- 
redt the Inftrument, towards any Objedt. 
Fig. 2. The Sedtion of the Inftrument, in which 
A B is the larger concave metalline Speculum, C D 
the lefier Concave metalline Speculum ; E Fa hollow 
Brafs Screw to fallen in the iff Dioptrical Glafs, or 
Plano 
