each cavity.

3. Compare with one another the breathing organs and the
mechanism of respiration in a frog and in a rabbit. Give figures
showing the condition of the heart and great arteries in these animals,
and indicate in each case the nature of the blood in the several
cavities of the heart.

4. Draw diagrams, with the parts named, illustrating the arrangement
of the chief arteries of (a) the frog, (b) the rabbit. (c) Compare briefly
the arrangements thus described. (d) In what important respects does
the vascular mechanism of the frog differ from that of the fish, in
correlation with the presence of lungs?

5. In the frog provided, free the heart, both aortic arches, dorsal aorta
as far as its terminal bifurcation, and both chains of sympathetic
ganglia from surrounding structures; and remove them, in their
natural connection, from the animal into a watch-glass.

6. Describe the male and female reproductive organs of the common
frog, and give some account of their development.

7. Describe, with figures, the bones of the limbs and limb-girdles of a
frog.

8. Remove the brain from the frog provided, and place it in spirit. Make
a lettered drawing of its ventral and dorsal surfaces.

9. Point out the corresponding regions in the brain of a frog and a
mammal, and state what are the relations of the three primary
brain-vesicles to these regions.

10. (a) Give an account, with diagrams, of the brain of the frog; (b)
point out the most important differences between it and the brain of
the rabbit. (c) Describe the superficial origin and the distribution of the
third, (d) of the fifth, (e) of the seventh., (f) of the ninth, and
(g) of the tenth cranial nerves of the frog.

11. Describe, with figures, the brain of a frog, and compare it with that
of a rabbit. What do you know concerning the functions of the several
parts of the brain in the frog?

12. Describe briefly the fundamental properties of the spinal cord in
the frog. By what means would you determine whether a given nerve
is motor or sensory?

13. Prepare the skull of the frog provided. Remove from it and place in
glycerine on a glass slip the fronto-parietal and parasphenoid bones.
Label them. Mark on the skull with long needles and flag-labels the
sphenethmoid and the pro-otic bones.

14. Compare the skull of the rabbit and the frog; especially in regard
to the attachment of the jaw apparatus to the cranium, and other
points which distinctly charac