Section of bone,

17 2. Structure of bone, magnified, 17 3. The skeleton, 18 4. Cells of cartilage, 20 5. Elbow-joint, 21 6. Spinal column, 22 7. The muscles, 24 8. Muscular tissue, magnified, 25 9. Biceps muscle of the arm, 26 10. View of knee-joint, 27 11. Appliance for strengthening the muscles, 35 12. Appliance for strengthening the muscles, 35 13. Parlor gymnasium, 36 14. Root and transverse section of hair, magnified, 43 15. Granules of potato starch, 61 16. Section of the trunk, 81 17. Section of a tooth,