48.(Pg. [42]) What do we conclude from elasticity respecting the contact of the particles of a body?
49.(Pg. [42]) Are those bodies always the most elastic, which are the least dense?
50.(Pg. [42]) Give examples to prove that this is not the case.
51.(Pg. [42]) All bodies are believed to be porous, what is said on this subject respecting gold?
52.(Pg. [43]) What conjecture was made by sir Isaac Newton, respecting the porosity of bodies in general?
53.(Pg. [43]) If you throw an elastic body against a wall, it will rebound; what is this occasioned by, and what is this return motion called?
54.(Pg. [43]) What do we mean by a perpendicular line?
55.(Pg. [43]) What is an angle?
56.(Pg. [43]) What is represented by [fig. 1. plate 2]?
57.(Pg. [44]) Have the length of the lines which meet in a point, any thing to do with the measurement of an angle?