1901) MICROSCOPICAL JOURNAL. 13 
bacillus causing the bubonic plague then prevalent in 
Hong-Kong. . | 
In 1894, Sanarelli discovered the bacillus icteroides, 
thought to be specific for yellow fever, 
A new era in bacteriology, and probably the most tri- 
umphant result of the modern scientific study of disease, 
was inaugurated by Behring, who presented to the world 
the “Blood-serum therapy,’ and showed as the result of 
prolonged, elaborate and profound study of the subject of 
immunity, that in the blood of animals with acquired im- 
munity to certain diseases (diphtheria and tetanus) a sub- 
stance was held in solution which was potent to save the 
lives of other animals suffering from the same diseases.”’ 
Notes on Microscopy. 
F, SHILLINGTON SCALES, F. R. M, S. 
GLASS Caits FoR Microscope SLipres.—There 
several methods for making glass cells for slides of in- 
sects, samples of ore, etc., each more or less convenient, ac- 
cording{to the depth of the proposed cell. For cells from one- 
tenth inch in depth and upward, we have found the plan of 
cutting a ring off a bit of soft glass tubing, the easiest and 
best. This is done very quickly and surely by running a 
diamond ‘pencil around the tubing at the required distance 
from the end, and touching the line thus made with the 
point of a red-hot poker or iron rod. To run the line smooth- 
ly and evenly, make a little supporter for the tube by nail- 
ing a couple of upright strips, notched at the top in V shape, 
to a wooden block, six inches long. Let the tube rest in the 
notches, apply the diamond firmly to the glass, and revolve 
the tube slowly, away from the person. A little practice will 
enable one to make a clean-cut scratch entirely around the 
tubing. In the absence of the diamond, a little slitting file 
may be-used. 
After the ring is removed, smooth the edges by grinding 
with emery powder ona leaden plate. For shallow cells, an 
