122 



MICROSCOPIC ILLUSTRATIONS. 



scribed : — It consisted of a circular brass table, in which 

 was cut a circular aperture half way between the centre 

 and the circumference. This table and aperture served 

 the purposes of an ordinary stage, and held a watch- 

 glass, trough, &c. to contain the object for dissection. 

 Under the aperture was placed the mirror ; and on the 

 opposite side to that where the aperture was made, was 

 inserted a socket, to which a number of universal joints, 

 strung together like a row of beads, were attached. On 

 the terminal one was placed the magnifier. Now fig. 27 



Fiff. 27. 



is a drawing of my instrument, placed in a vertical 

 position, as if intended for dissecting. Nos. 2, 3, represent 

 a wooden rest for supporting the hands ; this fits on to 

 the joint on the top of the pillar of the microscope, where 

 it is firmly retained. Near to each end, on the upper 

 surface of the rest, is a deepened or hollow place to pre- 



