p. 2: A line in the margin put emphasis on the second paragraph. Several words are underlined.
p. 6: A line in the margin  puts emphasis on 'toontekens'
p. 14: The paragraph that gives the name of note values in French, German and English and a paragraph about Gregorian 'neumen' are marked.
p.15: The parts about Gregorian 'neumen' are marked.