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? 46. Explain the cementing of glass. What is said of the adhesion of pieces of India-rubber? Describe and explain the experiment with bullets and with balls of lead. How may silver and gold be made to adhere to iron? What is said of the adhesion of tin and lead? What of the adhesion of panes of glass? 47. Upon what does the strength of adhesion depend? Illustrate the agency of heat in promoting adhesion. Give familiar examples of attraction between solids and liquids. Explain the experiment represented in Fig. 15. 48. What is said of stems in stagnant water? Explain Figs. 16, 17, and 18. 49. Explain Fig. 19. Explain the rise of fluids in tubes by Fig. 20. 50. What is meant by _capillary_ attraction? Give familiar examples of the rising of liquids in interstices. 51. Describe and explain the process of getting out millstones. How does a blotter differ from writing-paper? CHAPTER V. 51. What is the attraction of _cohesion_? Give examples of attraction between masses or portions of matter. 52. Explain the falling of a stone to the ground. Illustrate the fact that attraction is mutual. Give the illustration of the ship and boat in full. 53. Illustrate the proportion between the mutual motions of the attracting bodies. Give the calculation in regard to the motion of the earth in attracting smaller bodies. 54. What is said of the universality of attraction? Explain the tides. What is said of the attraction of the moon for the land? What is the difference between the attraction of cohesion and the attraction of gravitation? Why is the word gravitation thus used? What is terrestrial gravitation? 55. Explain Fig. 22. Explain Fig. 23. What is said of substances suspended in different parts of the earth? 56. Explain Fig. 24. What is said of plumb-lines? 57. What is weight? Give the comparison in regard to muscular force. What is said of scales and weights? What of using springs in weighing? 58. What would be the effect on weight if the density of the earth were increased? In what ways would this be perceived? What is said of the variation of weight with distance? 59. What is said of the difference of weight on mountains and in valleys? What of weight in the moon? What of it in the sun? What is said of the different modes of attraction?