54. What did the universities do to secure the multiplication of books and the correctness of copies?
55. How old is the practice of marking letters or words by some sort of stamp?
56. What early experiments did the Chinese make in printing?
57. Did these experiments have any effect in Europe?
58. What is a block book?
59. When were block books first made, and why?
60. Describe some famous block books.
61. Describe the process of making a block book.
62. What determined the form of the letters composing the text of block books?
63. Describe the four types of handwriting and their principal varieties.