232 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
be fixed in any desired spot by means of the screw (visible in fig. 64). 
The adjustment can be read off by the millimetre graduations marked 
on the lever. In this way the movements of the slide can be reduced, 
if desired, and the instrument adapted to smaller sections without the 
consumption of much time. Object-tables are supplied in various sizes, 
the largest being 13 by 10 cm. I, in fig. 63, shows the largest size table, 
and in fig. 64 a smaller one. The upper surfaces of the tables are divided 
by millimetre-broad streaks into 2 by 2 mm. squares, useful not only 
for strong attachment of the paraffin blocks, but also for their shaping. 
The screws partly visible in fig. 64 effect the adjustment of the object 
by rotation about three principal axes. The application of the knife 
Fig. 63. 
to the object can be done in rough adjustment either by pushing the 
object-table along a horizontal axis or by pushing the knife-holder. 
The final application requires the micrometer-screw. Three knife- 
holders are supplied; two for paraffin (K, fig. 63); one for celloidin 
(K, fig. 64). On the base-plate are on each side two grooves, which 
render impossible any deviation of the knife sideways or backwards. 
The knife-holder has a movement from front to rear of 8 • 5 cm., and can 
be fixed in any position on the base-plate by means of the screw visible 
in fig. 64. A caoutchouc tube A, whose purpose is to regulate the 
temperature of the knife and local section, runs along the knife-back, 
and is approximated to the knife, as required, by the screws a , a. The 
advantage of a rise in the local section temperature is that ribbon- 
