paraffin, but
better ones can be made by freezing. Farrant's solution makes a good
mounting.

The intestines also give a better section from freezing than by
embedding, as the paraffin injures the villi; mount in the same medium as
the stomach.

The liver may be embedded in paraffin, and the section mounted in
Farrant's solution or glycerine. The kidney may be treated in the same
way. The cornea of the eye can be readily cut by embedding in paraffin,
and the section may be mounted in Farrant's solution. The crystalline
lens and retina may be treated similarly.

The brain and spinal cord should be embedded in paraffin or a carrot, and
the section mounted in Dammar. Sections of the uterus and ovaries are
best mounted in glycerine or Dammar. Sections of lung maybe made by
embedding in gum or by freezing, and mounted in Farrant's solution.

Every slide should be of uniform size, and labeled. The usual size is 3x1
inches, and should be of a good quality of glass, free from scratches or
air holes. They may be labeled either by writing with a diamond, or a
small piece of paper affixed to one end, on which is written what is
required.

* * * * *

LIFE HISTORY OF A NEW SEPTIC ORGANISM.

At a recent meeting in London, of the Royal Miscroscopical Society, Dr.
Dallinger gave his annual address to what was probably the largest
gathering of Fellows ever assembled on a similar occasion. After briefly
referring to the increased interest lately manifested in the study of
minute organisms, and recalling the characteristics of the doctrines of
abiogenesis and biogenesis, he passed rapidly in review the results of
the observations of Tyndall, Huxley, and Pasteur as bearing upon these
questions, and called attention to the observations of Buchner as to the
transformation of _Bacillus anthracis_ and _Bacillus subtilis_, and _vice
versa_, and referred with approval to Dr. Klein's criticisms thereon.
Having spoken of the desirability of careful and continuous study of this
class of organisms, and the importance of endeavoring to establish the
relation of the pathogenic form to the whole group, he said he should be
better able to deal with the subject by recording a few ascertained facts
rather than by making a more extended review, and he therefore devoted
the main part of his address to a description of "the life history of a
septic organism hitherto unknown to science." In his observations of t