266 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
allow of displacements of 1/300, 1/150, 1/100, 1/75, 1/60, 1/50 mm. 
For smaller displacements use is made of tlie second small toothed wheel 
C (fig. 33), which by a slight displacement is made to engage in the 
Fig. 33. 
A 
large one. By means of the star belonging to this wheel displacements 
of 1 to 6 p can be obtained. The knife rests in clefts in two strong 
uprights, and is clamped and adjusted by two screws. 
This instrument has the advantage over the rocking microtome, that 
