24. What is the object of the eyelashes? Are the hairs straight?
25. What is the use of winking?
26. When you wink, do the eyelids touch at once along their whole length? Why?
27. How many rows of hairs are there in the eyelashes?
28. Do all nations have eyes of the same shape?
29. Why does snuff taking cause a flow of tears?
30. Why does a fall cause one to "see stars"?
31. Why can we not see with the nose, or smell with the eyes?
32. What causes the roughness of a cat's tongue?
33. Is the cuticle essential to touch?