CHRONIC SYNOVITIS—DROPSIES. 333 
be left in the cavity; notwithstanding, the subsequent phenomena have: 
nothing alarming. In a horse affected with a large tarsal thoroughpin,. 
we have injected 100 cubic centimeters of a solution of iodine to the third,. 
without being able to draw out a noticeable quantity ; no accident resulted. 
from it; three months later, the tumor was considerably reduced. The. 
operation ended, the canula is withdrawn, avoiding to pull on the skin,. 
and the wound is closed with collodion. 
The solution of iodine has been used in various degrees of concentra- 
tion. In man, Bonnet has used it pure first, afterwards he employed a 
solution made of 16 grammes of water, 2 of iodine, 4 of iodide of potas~ 
sium. Like Velpeau, Leblanc and Thierry mixed, as we said before, x 
Fig. 80.—Potain’s Aspirator. 
part of the tincture with 2 of water. Barrier added to the tincture equal’ 
part of camphorated alcohol. We use the tincture of the Pharmacopceia, 
to which we add 2, 3 or 4 parts of boiled water and a small quantity of” 
iodide of potassium to dissolve the iodine which precipitates by the mix- 
ture of the two fluids. . 
Though the animal shows no pain after the operation, absolute rest is:: 
indispensable. The days following, the region becomes painful and swol- 
len; in some horses there is a high fever and great lameness; others 
exhibit but slight reaction. When the operation has been made asepti- 
- cally, the inflammatory phenomena soon diminish. After the fourth’ 
week the animal can resume his work. The therapeutic results cannot be- 
appreciated for several months. 
* How do iodined injections act? For Pérosino, they produce adhesions: 
of the synovial walls. Bouley long ago showed this to be an error: “ the- 
serous in the parts where it is far from the center of the motion, in its:. 
diverticulums, is very vascular ; there, deposits of plastic matter take place. 
