[37] Ib. 44, 46, 47, 48, 58, 60, 63, etc. [↑]

[38] Ib. 45. [↑]

[39] Ib. 30. [↑]

[40] Ib. 57. [↑]

[41] Ib. 66. Cp. 67–69. [↑]

[42] Id. Pensieri sulla natura. 80–86. [↑]

[43] Shortly after Leonardo we find Girolamo Fracastorio (1483–1553) developing the criticism further, and in particular disposing of the futile formula, resorted to by the scientific apriorists of the time, that the “plastic force of nature” created fossils like other things. [↑]

[44] Id. Pensieri sulla morale, passim. [↑]

[45] Ib. 7. [↑]

[46] Ib. 44, 45. [↑]