At this point, the old charges had attained a standard form. What became known as the York Legend had emerged in a form that would survive into Preston's "Illustrations of Freemasonry", a work of 1772 which was still being reprinted in the mid nineteenth century. The requirement for every new admission to be sworn to the Old Charges on the bible now meant that every lodge should have its own manuscript charges, and over a hundred survive from the seventeenth century until the period in the eighteenth when their use died out. Describing them all is beyond the scope of a single article, and unnecessary since differences are only in details, such as occasional clumsy attempts to deal with the absence of Edwin, Athelstan's son, from any historical record. Differences also occur in the specifics of the charges and the manner of taking the oath. A very few manuscripts have a separate "Apprentice Charge". Families of documents have been identified, and two systems of classification exist. A few documents deserve special attention.