ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
375 
viously described by Schaffer in the same journal,* but possesses a 
certain modification in the regulation of the movement apparatus by 
automatic stop and release mechanism, as well as an apparatus for 
square sections of the paraffin block. These modifications virtually 
amount to a new instrument, which seems highly ingenious. The view 
from above is shown in fig. 62, and from below in fig. 63. 
A strong cast-iron base (A in fig. 63) bears on its upper side two 
upright pillars about 5 cm. high. In the pillars lies a horizontal axis 
on which a frame H (fig. 62) rotates. The frame carries a screw St 
whose end extends beyond the lower surface of the frame, and passes 
further on into the groove of an excentric mounted beneath the frame. 
This excentric wheel runs on an axis a mounted above the cast-iron 
base, which axis carries a winch wheel A of 10 cm. diameter on the 
end extending beyond the frame. 
By the rotation of the large winch, and the consequent rotation of 
the excentric, the frame H is raised and depressed with a kind of pen- 
dulum motion. A corresponding movement follows of the object-holder 
fastened to its end, and therewith of the object to be cut. The object- 
* Cf. this Journal, 1896, p. 572. 
