[Kinds of fire:—(i) flame; (ii) light; (iii) red heat. Kinds of air:—(i) æther; (ii) mist. There are also other kinds without names. Kinds of water:—(i) liquid; (ii) fusile. The former is mobile; the latter is solid, but melts when heated,—congealing again as it cools. Of the fusile kind are (1) gold, (2) adamant, (3) copper. The phenomenon of rust. To natural science the student of the eternal may turn for recreation.] In the next place we have to consider that there are divers kinds of fire.