126 
BULLETIN OF THE LABORATORIES 
cut illustrates the form of lathe used for this purpose in our own labo- 
ratory. It was manufactured at the suggestion of this department 
and is not only more convenient and elegant, but less expensive than 
any other lathe at present in the market. It is constructed by W. F. 
and John Barnes Co., of Rockford, 111. 
In the study of the section thus prepared a microscope is used 
which is especially arranged for this purpose. The appearance of 
such an instrument is illustrated by the accompanying figure which 
