igure given of this. Skin the cheek, and see VII. running over it.
Cut through malar and remove it; cut through lower jaw-bone and turn
it back, to see the third branch of the fifth nerve on its inner side;
examine the muscles of eyeball, and remove it, to expose the first
and second branches of V.-- the latter is especially deep within orbit.
Remove, open, wash out, and examine the heart. Shave off the dorsal
wall of cranium, to expose hemispheres of brain, and then put the
head in strong spirit for a week or so. With a second rabbit, this
dissection may advantageously be varied by removing the lower jaw,
cutting -up- [through] soft palate, and observing openings of the
Eustachian tubes. [The tonsils (on the ventral side of the soft palate)
must not confused with these.] The heart should also be cut out,
washed out and examined (Compare Sections 38, 44.)

Third Dissection.-- (Before this is performed the mammalian skull
should have been studied and examined.) Take the head of a rabbit,
the brain of which has been hardened by spirit, and carefully remove
cranium; be particularly careful in picking away the periotic bone, on
account of the flocculi of cerebellum. It is difficult to avoid injury to
the pituitary body embedded in the basisphenoid bone. Examine with
the help of Sheet 8. Make the sections there indicated.

-The Frog_

May be killed by drowning in dilute methylated spirit, or by chloroform.
Take a recently-killed frog, and examine a drop of its blood, spread
out on a glass slip, under the microscope; compare it with your own.
Before using the high power, put a cover glass over the object, of
course. Scrape the roof of the mouth of the frog gently, to obtain
ciliated epithelium; and mount in very weak salt solution-- the cilia will
still be active. Squamous epithelium may be seen by the student
similarly scraping the interior of his own cheek. Take a piece of
muscle from one of the frog's limbs, tease out with needles upon a
glass slip, and examine. To see the striations clearly, the high power
will be needed. Compare a piece of muscle from the wall of the
alimentary canal. Similarly examine nerve and connective tissue.

First Dissection.-- Pin out the frog in a dissecting dish, ventral surface
uppermost, and cover with water. Open up the skin along the
mid-ventral line. Note the large sub-cutaneous lymph spaces, the
pelvic and pectoral girdles, and the anterior abdominal vein. Cut into
the body cavity o