37. What is said of perpetual motion? Why is it not true of divisibility that it is an essential property of matter? What is said of weight?
CHAPTER IV.
38. What is said of the nature of attraction? What was Newton's idea of it?
39. What is said of attraction in solids? What of its different modes of action? What is the difference in attraction in the case of steel and of water? What is said of the freeness with which particles of a fluid move among each other?
40. Explain Fig. 9. Explain Fig. 10.
41. Give the difference between mercury and water in regard to the globular form. What if said of drops of water on leaves?
42. What is said of oil in reference to attraction? Describe and explain the manufacture of shot. What is said of the globular form of the earth and the heavenly bodies?
43. What is said of crystallization? State the examples cited. What is said of the crystallization of water? Give and explain the example of sudden crystallization.
44. What is said of frost-work? What of snow?
45. What is stated in regard to the snow-crystals of the arctic regions? What is said of order in nature? Why can you not make the surfaces of broken glass adhere?