11. _General Science_: Todd, Astronomy; Wentworth and Hill, Physics; Remsen, Chemistry; Brigham, Geology; Parker, Biology; Martin, Physiology; Ward, Fairbanks, or West, Sociology; Walker, Political Economy. 12. _Theological Encyclopædias_: Schaff-Herzog (English); McClintock and Strong; Herzog (Second German Edition). 13. _Bible Dictionaries_: Hastings; Davis; Cheyne; Smith (edited by Hackett). 14. _Commentaries_: Meyer, on the New Testament; Philippi, Lange, Shedd, Sanday, on the Epistle to the Romans; Godet, on John’s Gospel; Lightfoot, on Philippians and Colossians; Expositor’s Bible, on the Old Testament books. 15. _Bibles_: American Revision (standard edition); Revised Greek-English New Testament (published by Harper & Brothers); Annotated Paragraph Bible (published by the London Religious Tract Society) Stier and Theile, Polyglotten-Bibel. An attempt has been made, in the list of text-books given above, to put first in each class the book best worth purchasing by the average theological student, and to arrange the books that follow this first one in the order of their value. German books, however, when they are not yet accessible in an English translation, are put last, simply because they are less likely to be used as books of reference by the average student. PART II. THE EXISTENCE OF GOD. Chapter I. Origin Of Our Idea Of God’s Existence. God is the infinite and perfect Spirit in whom all things have their source, support, and end. On the definition of the term God, see Hodge, Syst. Theol., 1:366. Other definitions are those of Calovius: “Essentia spiritualis infinite”; Ebrard: “The eternal source of all that is temporal”; Kahnis: “The infinite Spirit”; John Howe: “An eternal, uncaused, independent, necessary Being, that hath active power, life, wisdom, goodness, and whatsoever other supposable excellency, in the highest perfection, in and of itself”; Westminster Catechism: “A Spirit infinite, eternal and unchangeable in his being, wisdom, power, holiness, justice, goodness and truth”; Andrew Fuller: “The first cause and last end of all things.” The existence of God is a first truth; in other words, the knowledge of God’s existence is a rational intuition. Logically, it precedes and conditions all observation and reasoning. Chronologically, only reflection upon the phenomena of nature and of mind occasions its rise in consciousness.