Io INTRODUCTION. 
are not being dissected. A number of dogs can 
be kept in good condition in this way with but 
little expense, especially if it is possible to remove 
the intestines, or at least the large intestine and rec- 
tum, after the first day. This method of preserving 
the animal has the great advantage of not decolorizing 
any of the tissues, and furthermore prevents the sour 
odor which soon comes on after using preservative 
liquids... li ies) mop possible to, make use, of jthis 
method, and it is necessary to keep the animal for 
some time, recourse must be had to some of the usual 
preservative liquids. Immersing the dog in alcohol 
will keep it from decomposing, but leaves it in such a 
bad condition for dissecting that it is not to be recom- 
mended. Wickerscheimer’s liquid injected into the 
arteries after having previously washed out the blood 
with 0.6% sol. of NaCl is highly recommended, though 
my experience with it has been unsatisfactory. The 
formula for this liquid is as follows: Dissolve in 3 
litres of boiling water 100 grms. of alum, 25 germs. of 
common salt, 12 grms. of potassium nitrate, 60 grms. 
of potassium carbonate, and 20 germs. of arsenious acid ; 
after cooling add 14 litres of glycerine and + litre of 
alcohol. A liquid which I have tried but few times, 
but which has given satisfaction, is made by mixing 
one part of glycerine with two parts of a 2% solution 
of corrosive sublimate, and adding to this mixture 
crystals of chloral hydrate in the proportion of 2 grms. 
of chloral to each 100 cc. of the liquid. This liquid 
keeps the animal pliant, does not destroy the color, 
and seems to bring out the nerves more distinctly. 
Necessary Dissecting Instruments —Each_ student 
should be provided with a small case of dissecting in- 
struments containing at least the following things: 
