is movable or immovable, finite or infinite, namely, the power of God, or species, or fire, or air, or water, or earth; or that the number is two, matter and God; or three, matter, form and motion; or six, viz., the four which he himself adopts, and composition and separation; or the number ten, which is the end and completion of number. In the course of this discussion he takes occasion to define pain and pleasure, the nature of species, the difference between element and principle. And thus the book draws to a close. Not very promising material this, it would seem, for the ideas of which we are in search. The other book, that dealing with definitions of things, is more promising. For while there too we do not find any connected account of God, of the world and of man, Israeli's general attitude can be gathered from the manner in which he explains some important concepts. The book, as its title indicates, consists of a series of definitions or descriptions of certain terms and ideas made use of by philosophers in their construction of their scheme of the world--such ideas and terms as Intelligence, science, philosophy, soul, sphere, spirit, nature, and so on. From these we may glean some information of the school to which Israeli belongs. And in the "Book of the Elements," too, some of the episodic discussions are of value for our purpose. Philosophy, Israeli tells us, is self-knowledge and keeping far from evil. When a man knows himself truly--his spiritual as well as his corporeal aspects--he knows everything. For in man are combined the corporeal and the spiritual. Spiritual is the soul and the reason, corporeal is the body with its three dimensions. In his qualities and attributes--"accidents" in the terminology of Israeli--we similarly find the spiritual as well as the corporeal. Humility, wisdom and other similar qualities borne by the soul are spiritual; complexion, stature, and so on are corporeal. Seeing that man thus forms an epitome, as it were, of the universe (for spiritual and corporeal substance and accident exhausts the classes of existence in the world), a knowledge of self means a knowledge of everything, and a man who knows all this is worthy of being called a philosopher.