This lecture will give some general introduction into the emergence of the canon, the better known Apocrypha of the Old Testament, and the significance of some of the most prominent Pseudepigrapha. Constantin Tischendorf, one of the greatest textual scholars of the Old and New Testament, and well-known for his discovery of the Codex Sinaiticus, edited also many apocryphal and pseudepigraphical works. He knew the value of these books in two major aspects: (1) They can give valuable information about the language, patterns of thought, and popular beliefs at the time of their formation. (2) They are a background against which the Greek scriptures unfold their real intellectual depth, historical entrenchment, and redemptive power.