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irculatory, (c) the excretory, and (d) the reproductive organs of the amphioxus. 2. Describe the stomach and intestines of the dog-fish and rabbit, and point out in what way their differences are connected with diet. 3. Describe the mechanism of respiration in the adult frog, and contrast it with that of the tadpole. 4. Give an account of the structure of the epidermis and its outgrowths in the frog and the rabbit. 5. Describe the organs of circulation (heart and main arteries and veins) and respiration in the frog in its mature and immature states. 6. Give a brief account of the physiology of respiration. Describe fully the means by which respiration is effected in the following animals:-- frog, amphioxus, rabbit, and dog-fish. 7. Describe the minute structure of the blood of the rabbit, frog, and amphioxus. 8. Describe and illustrate by means of sketches the chief points of difference between the skeleton of the rabbit as a typical mammal, and that of the common frog as a typical amphibian. 9. (a) Explain what is meant by the term "central nervous system." (b) Describe the tissue elements which enter into its composition. (c) Explain, as far as you can, the function of each structure described. (d) How is the central nervous system developed in the frog, and (e) in the rabbit? (f) What conclusions may be drawn from the facts stated as to the origin of the central nervous system in evolution? 10. Give an account of the structure (including histology) and of the functions of the spinal cord and spinal nerves of the frog. 11. Give a description of the minute structure and chemical characters of the following tissues as seen in the frog:-- cartilage, bone, muscle. From which of the primary cell-layers of the embryo are they respectively developed? 12. What substance is excreted by the renal organ of a frog, and what relation does this substance bear to the general life of the organism? Describe the parts by which similar excretion is believed to be effected in amoeba, hydra, earthworm, mussel, and lobster. 13. Describe, with illustrative sketches, the structure of the connective tissue, cartilage, and muscular tissue of a frog. Also describe the structure of the muscular tissue of the lobster and snail. 14. Give in account of the more important features in the development of the frog. 15. Describe and compare the structure of the renal organs in a frog and a rabbit. 16. Give an account o
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