"Fact" means and includes-- any thing, state of things, or relation of things, capable of being perceived by the senses; any mental condition of which any person is conscious.  Illustrations  (a) That there are certain objects arranged in a certain order in a certain place, is a fact.  (b) That a man heard or saw something, is a fact. (c) That a man said certain words, is a fact.  (d) That a man holds a certain opinion, has a certain intention, acts in good faith or fraudulently, or uses a particular word in a particular sense, or is or was at a specified time conscious of a particular sensation, is a fact