98 VETERINARY OBSTETRICS. 
be added sedatives or anodynes, as tincture of opium, 
tincture or fluid extract of belladonna, or chloral hydrate. 
To the constriction apply equal parts of solid extract 
of belladonna and vaseline. Internally administer 
chloroform, tincture of opium, or chloral, and keep the 
animal quiet as possible. These failing, try to dilate 
the os by force, as by the introduction of the fingers, 
which will sometimes bring about relaxation. 
Another method is by inserting a dry cone-shaped 
sponge, and then wetting it; as it increases in size, the 
os may dilate. 
Another is to insert a bladder into the opening of 
the os, and then distend it with hot water; or, insert a 
rubber bag, similar to a ‘“ Barnes’ Dilator” (used in 
human practice), and inflate it with air, or distend it 
with hot water. 
ee 
WEISS & SON — 
Fic. 44. 
BARNES’ UTERINE DILATOR. 
Should all these methods fail, make an oblique or 
lateral incision with a probe-pointed bistoury. Be 
careful that the incision is not made above or below, 
on account of injuring the contiguous structures in 
those situations. 
