1887] Microscopy. 597 
cover of the basin. For very small objects a hammered-wire 
spoon, like that used by Dr. Mark, is mounted in the same way 
as the basket (Fig. 2). This method of nibpeetiang objects in 
paraffine has resulted from attempts to avoid long handles, or 
other belongings of the baskets, that prevent the close fitting of 
the plates of glass used to cover the paraffine dishes 
A New Section-Smoother.'—Dr. P. F. Mall recommends a 
section-smoother constructed on the following principle. It con- 
sists of a rubber rod, about 14% cm. in diameter, which rotates 
loosely on a solid axis. The rod is so placed that it hangs a little 
below and in front of the edge of the knife (Fig. 1). When the 
PIG k FIG 2. 
knife passes over the object the rod is raised to an extent equal 
` to the thickness of the section, and is thrown above and a little 
behind the edge of the knife (Fig. 2), so that the section is pre- 
vented from rolling as it slides upon the knife. When the knife 
-is shoved back preparatory to making the next section the rod 
rolls over the preparation, and, in consequence of the play of its 
axis, is kept free from edge of ‘the knife. The section does not 
stick to the rod, as is the case in Jung’s section-smoother. 
K New Paraffine Im bedding Apparatus tus.—Those who have 
had much experience in imbedding in paraffine are aware of the 
difficulties and risks which attend the imbedding of delicate 
objects on account of the danger of overheating the imbedding 
mass. The trouble with thermostats, or heat-regulators, is that 
they get out of order and give trouble, cor from the difficulty 
which arises from the variations in the pressure of the gas in the 
pipes which supply the burners, and which is entirely beyond 
col ostat. 
l EA avoid this, Dr. C. S. Dolley, of the Soga Sa 
oF the University of Pennsylvania, began a series of experim 
AR * Archiv f. Anat, u. Physiol, Anat. Abth., E 
VOL, XXL—NO, 6, 40 
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