696 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
tedious process involved in regulating the position of the object in 
ordinary microtomes. With this object he has devised the mechanism 
shown in figs. 108-10. In the micrometer* screw there is a second 
Fig. 109. 
screw^wliich can be raised or lowered, and with it the object-clamp, 
independently of the micrometer-screw. 
In fig. 109 the second screw b is seen inside the spindle a of the 
micrometer-screw. In this it slides smoothly, and is prevented from 
being drawn out too far by the little screw e. 
Fig. 110. The milled head / has a nucleus of steel and 
serves as nut to the screw-thread c on b, so that 
on turning it to and fro the screw b , and with 
it the object-clamp, can be adjusted in height. 
In the Reichert microtome the slide of the 
object-clamp is pressed downwards by a spring 
(a, fig. 108). In this case the milled head / 
need simply rest upon the spindle b. In other 
microtomes, however, which do not possess such a spring, / must be 
attached to a plate Z on the toothed wheel li , in such a way that it can 
turn, but cannot rise or sink on the spindle b. 
Fig. 110 shows how this is effected by two hooks mv from the nut / 
engaging in a groove on the edge of the plate Z. 
Section-Stretcher for Paraffin Sections with the Gathcart Im- 
proved Microtome.* — Dr. K. Kornauth remarks that with the Cathcart 
microtome, in the case of objects imbedded in paraffin, there is such a 
tendency for the sections to roll up together, that the production of a 
* Zeitschr. f. wiss. Mikr., xiii. (1896) pp. 160-3. 
