Two notes on the history of biology

Résumé 0

This paper has two historical notes concerning biology: in the first one, we wish simp ly to point out again that the operon model, due to 1965 Nobel laureates François Jacob and Jacques Monod in the 1950s, might be laid out within the historical framework o f the epigenetics, as well as one of its first biological models making use of a systemic approach, at the crucial crossroad fro m pro karyotes to eukaryotes , while, the second one, regards the celebrated work of D'Arcy Wentworth Thompson, entitled On Growth and Form and published in 1917, which has been a milestone of mathematical and theoretical biology, but it has yet undergone some criticisms due to the alleged inco mpatibility of some its ideas and assumptions with respect to Darwinian main ideas, so we wish simp ly clarify such dyscrasias making use of some mathemat ical notions and tools able to build up a possible formal framework, within which to lay out better those D'Arcy Thompson's ideas deemed to be liable to have given rise to such incompatibilit ies, with the end to dispel or minimize these.