112 



Microscopical Essays. 



C, a plane glafs, with a fmall piece of black {ilk (luck on it ; 

 this glafs is to lay in a groove made in the ftage B. 



M, a hollow glafs, to be laid occafionally on the ftage inftead 

 of the plane glafs C. 



L, a pair of nippers. Thefe are fixed to the ftage by the pin 

 R ; the fteel wire of thefe nippers Aides backwards and forwards 

 in the focket, and this focket is moveable upwards and down- 

 wards by means of the joint, fo that the pofition of the object 

 may be varied at pleafure. The object may be fixed in the nip- 

 pers, ftuck on the point, or affixed by a little gum water, &c. 

 to the ivory cylinder N. 



O, a fmall pair of forceps to take up fmall objects. 



P, a brufh to clean the glafles. 



To use Ellis's Microscope. 



Take all the parts of the apparatus out of the box ; then be- 

 gin by fere wing the pillar A to the cover thereof; pafs the pin 

 R of the femicircle which carries the mirror through the hole 

 that is near the bottom of the pillar A ; pufh the ftage into the 

 dove-tail at B. Aide the pin into the pillar, (fee the N. B. above) 

 then pafs the bar E through the focket which is at the top of the 

 pin D, and fcrew one of the magnifying lenfes into the ring at F. 

 The microfcope is now ready for ufe ; and though the enumera- 

 tion of the articles may lead the reader to imagine the inftrument 

 to be of a complex nature, we can fafely affirm, that he will find 



it 



