| 
RECORDS. I2I 
This book must not be lost or misplaced. ‘The advantage of having the serial 
number written also on the bottle containing the stock of preserved material is very 
evident if a thing of this sort ever happens. ‘The serial number is written on one 
edge of the slide-box, and serves to identify it (fig. 103). 
Some record besides a mere number should also be placed rh 
on the slide-boxes. All the slides within bear this num- : 
oe 
ber, é. g., 256, and also a 
series number of their own, 
Z. @.,1 to 25.. The slide- 
boxes are then filed away 
* on shelves either serially 
or in groups, according to os 
the parasite. Slides con- 
taining particularly good 
fields are marked X, and when the best fields are 
finally decided upon their location is recorded as de- 
termined on the mechanical stage. In case a dozen 
or more serial sections are included on one slide the 
the extra good ones are marked X on the first exam- 
ination, and the others O, as shown in fig. 113. 
When one of these sections has been drawn or photo- 
graphed, the X is underscored or inclosed by a circle. 
This method enables one to keep track of any num- 
ber of sections. Free-hand sections may be made with the Torrey razor shown in 
fig. 114D. This is altogether the best razor the writer has used. When very 
dull it may be sharpened on an India oil-stone. These stones are said to be made 
of a mixture of carborundum and clay, baked at a high temperature. They may be 
tii iim 
uITT its Bs 
tr } 
Fig. 110,+ 
gia ae aa 
—« 
Fig, 111.4 
had of the Norton Emery Wheel Company, Worcester, Mass., in three grades of fine- 
ness, the finest being usually coarse enough for the dullest razors. The size needed 
is 8 by 2 by 1 inch. ‘The finishing may be done on an Arkansas oil-stone, with a 
*Fic, 109.—Coplin’s staining jar. About one-half actual size. 
+Fic, 110.—Cross-section of Coplin’s staining jar. About actual size. 
¢Fic. 111.—A series of Coplin’s jars filled and properly arranged for staining sections fastened 
to slides. 
