18.(Pg. [13]) How do odours exemplify the minuteness of the particles of matter?
19.(Pg. [13]) Can matter be in any way annihilated?
20.(Pg. [13]) What becomes of the fuel, which disappears in our fires?
21.(Pg. [14]) How can that part which evaporates, be still said to possess a substantial form?
22.(Pg. [14]) What do we mean by inertia?
23.(Pg. [14]) Give an example to prove that force is necessary, either to give or to stop motion.
24.(Pg. [14]) What general power do the particles of matter exert upon other particles?
25.(Pg. [15]) What is that species of attraction called, which keeps bodies in a solid state?
26.(Pg. [15]) Does the attraction of cohesion exist in liquids, and how is its existence proved?
27.(Pg. [15]) If the particles of air attract each other, why do they not cohere?