These are very important writings. About half the writings of this book are by a group of writers known as "the Apostolic Fathers," who still had "the preaching of the Apostles ringing in their ears," St. Ignatius of Antioch. St. Clement of Rome, Polycarp, and the Shephard of Hermes. Other writings were not included in the canon, but have informed the Tradition of the Church, such as the Proto-Evangelion of James, and the Acts of Paul and Thecla. Other books offer colorful, if apocryphal, accounts of Christ in His childhood.
I do not mind that "archaic" language, I read the Authorized version daily. This particular edition of New Testament Apocrypha was translated in the 17th and 18th century, and published a complete book originally in 1926.