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TESTICLE.

A testiele of an adult should be chosen free from disease,
and great care is requisite in removing it from the body.
First, enlarge the ring of the oblique muscle, push the testicle
through from the scrotum, and separate its cellular connect-
ing substance ; then cut the spermatic artery and pampini-
form plexus as high as possible, and then the vas deferens.

Preparation. When well soaked, press out the blood from
the veins; put a pipe into the spermatic artery, and another
into a vein; and secure all other open mouths.

Injection. Red is to be sentjnto the artery, and yellow ov
blue into the vein, which is without valves. Then fix the
quicksilver tube in the vas deferens, and suspend it in w ater;
this done, fill it with mercury, and in twenty-four hours it
may be removed to be dissected.

Dissection. Cut away the tunica vaginalis and the tunica
albuginea, which requires great care: then remove all the
cellular and adipose membrane, and dry it on a board previ-
ously waxed.

Preservation. In a common preparation-glass, on a blue or
green paper ground.

THE SYSTEM OF THE VENA PORTiE.

Remove the liver, spleen, stomach, and intestines all toge-
ther, of a person whose mesentery is free from fat, cutting
away at the root of the mesentery, behind the peritoneum.

Preparation. Cut into a mesenteric vein, as near to the in-
testine as possible, and secure it with a ligature passed around
it with a needle, taking care not to wound aiiy other vein-
 
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