TWO:A document purporting to be Aristotles will has been preserved by Diogenes Laertius, and although some objections to its authenticity have been raised by Sir A. Grant, they have, in our opinion, been successfully rebutted by Zeller.180 The philosophers testamentary dispositions give one more proof of his thoughtful consideration for the welfare of those about him, and his devotion to the memory of departed friends. Careful provision is made for the guardianship of his youthful children, and for the comfort of his second wife, Herpyllis, who, he says, had been good to him. Certain slaves, specified by name, are to be emancipated, and to receive legacies. None of the young slaves who waited on him are to be sold, and on growing up they are to be set free if they deserve it. The bones of his first wife, Pythias, are, as she herself desired, to be laid by his. Monuments are to be erected in memory of his mother, and of certain friends, particularly Proxenus, who had been Aristotles guardian, and his family.A common angular-pointed drill is capable of withstanding a greater amount of strain upon its edges, and rougher use than any other cutting implement employed in machine fitting. The rigid support which the edges receive, and the tendency to press them to the centre, instead of to tear them away as with other tools, allows drills to be used when they are imperfectly shaped, improperly tempered, and even when the cutting edges are of unequal length.