(1) (p. 47). Etigene Muntz, Leonardo do Vinci, Artist, Thinker, and Man of Science, 2 vols., New York, 1892. Vol. II., p. 73.
+v7/Ex6mD3Lks8Nja/6hEFdTSveYstdmlNI0Wrp5C0LVoBORlyHlm1Z8+jAbwoUZ