At the head of these guides I shall respectfully place the learned and perspicuous Heineccius, a German professor, who died at Halle in the year 1741, (see his Eloge in the Nouvelle Bibliothéque Germanique, tom. ii. p. 51 - 64.) His ample works have been collected in eight volumes in 4to. Geneva, 1743 - 1748. The treatises which I have separately used are,