Reptile animae viventis. Filosofia naturale aristotelica ed esegesi biblica nella Summa theologiae di Alberto Magno

Albert the Great’s theological and exegetical-biblical works often reshape natural-philosophical doctrines derived from his earlier Aristotelian paraphrases. Accordingly, Albert’s caveats, distinguishing the treatment of topics in physicis and in theologicis, are not abstract disciplinary borderlines but point out to his Dominican students that he will return to crucial matters of the peripatetic paraphrases, recontextualizing them in later works. This article illustrates such interdisciplinary dynamics by analyzing Albert’s commentary on Gen., 1, 20-23, the fifth day of creation, as discussed in his STh., II, xi, 60. Albert questions the seeming asymmetry arising from a single element, water, giving rise to two different outcomes: birds for the sublunar heaven and reptiles for the earth. The arguments put forth by opponents and Albert’s solution draw upon earlier natural-philosophical works of his, namely De animalibus, De vegetabilibus, and De sensu et sensatu. Notably, Albert reuses his doctrine of humiditates in living bodies and generative processes (such as humidum seminale, humidum vaporativum, humidum spirans, humidum manens). Additionally, Albert analyzes the processes of subtiliatio and digestio, which transform siccum terreum into the matter required for the formation of animate bodies.