1072 General Notes. . [ December, 
the levers may be made to act so that the catch (/) will take any 
desired number of teeth by every revolution of the object. The 
knife moves only during that part of the revolution when the ob- 
ject is. not in contact with the knife. The ribbon of sections 
slides downward from the knife and is caught on a piece of paper 
placed upon the table. 
The wheel holding the object, as well as the razor, can be 
moved so that almost all parts of the edge of the razor can be 
used. 
The frame bed of the microtome is made of iron, the screw ob 
_ Steel, and all the rest is brass. Any ordinary microtome knife or 
_ razor may be used, ) 
The machine has been in use for a year and gives the greatest  — 
satisfaction. It can be used with great rapidity, but so far the best —— — 
results have been obtained at a rate of not over a hundred sec- i 
tions to the minute. The only possible error in a revolving 
of this kind is theoretical—namely, that owing to the 
ic : of the object, each section is part of a hoto 
