vi c The Microfcope explained. 
There are alfo added to this apparatus already de- 
fcribed, two glafs planes broader than that of No. 2. 
and two others with hallows ground in them ; they are 
to be laid upon the ftage DD, to receive any accidental 
objeCt that may occafionally offer. Small live infeCts 
may be confined between two of them, one having a 
hollow, and the other being a plane furface. Thofe 
with hollows in them are proper to obferve the animal- 
cula in fluids, being laid upon the ftage. 
The circulation of the blood may alfo be very well 
obferved in the tail of any fmall fifh, as well as between 
the toes of a frog, by tying it to one of the long glafs 
plates, marked No. 2. in fig. 3. 
There are likewife a few flat round glafies, No. 12. 
of different colours, fitted to the hole T, in the ftage 
D D, and a watch glafs fitted to the fame place, which 
will hold more water than the hollows in the long 
glafies juft above mentioned, and a fett of glafs tubes. 
No. 10. 
To thefe if defired may be added a micrometer, and a 
frog frame, which will be defcribed in their proper 
places. 
There are two fockets fixed to the Aider W, one of 
which is feen at Pj %> 3 * Their ufe is to hold the 
frog frame if required. 
The ufe of the improved folar microfcope. 
T HIS microfcope, from the very great extent of its 
magnifying power, and the convenience of view¬ 
ing any objeCt by many perfons at one and the fame 
time, gives more fatisfa&ion and greater pleafure than 
any other microfcope to the generality of obfervers; as 
will appear by the following directions, in fhewing how 
it is to be applied. 
Make. 
