Dissecting Microscopes 
and Magnifiers. 
Dissecting Stands. 
*Dissecting Stand I after Paul Mayer. Heavy horse- 
shoe foot; the stage consists of a large metal frame (10X10 cm 
= 4X4 in.) to which are attached wooden folding handrests ; 
adjustment by rack and pinion, plane and concave mirrors with 
universal motions. The triple dissecting system No. 76 forms a 
suitable combination for "teasing" small objects on a slip or 
in a watch-glass ; it may be fixed in the ordinary lens-holder and 
a metal plate with stage opening of the usual size, which can be 
closed below by a black or white disc, may be placed under 
the object into a recess provided in the stage-frame. In the 
examination of large objects, particularly living 
aquatic animals, the aplanatic lenses Nos. 78 and 79 (6 and 
10 dia.) will be found useful ; they fit into a separate arm which 
may be inserted into the ordinary lens support and, by this 
arrangement, the whole of the stage can be scanned. In this 
case the metal stage is replaced by a glass plate, and the above- 
mentioned white and black discs serve as convenient means of 
modifying the illumination. With low powers a disc of white 
drawing paper should be clamped over one of this mirrors by 
means of a clamping ring supplied with the instrument for this 
