The present essay analyzes an eighteenth-century phase of the querelle des monstres and highlights two main points. 1) As the cases of Lémery and Winslow demonstrate, in the period when preformation was the dominant view, the dispute over the origin of monsters carried into the very field of preformation the contrast which had originally opposed it to the now defeated model of epigenesis, namely the alternative between mechanical genesis and pre-existence of the monstrous form itself. 2) One of the most (...) important episodes in the shift of teratology from a primarily theological or metaphysical issue to a purely natural one was due to Albrecht von Haller. Haller shifted the dispute from anatomy to embryology; and it is on an embryological base and not on metaphysics that he built his own demonstration of the original nature of the monster. He was furthermore the only scientist of authority who dealt with teratology from an epigenetic standpoint. His numerous changes of view in the field of embryology did in fact never affect his early adherence to the thesis of original monstrosity. (shrink)

Spallanzani was in contact with a large number of European scholars, but he never succeeded in forming a group around him. We must consider a true exception his research on animal regeneration, started in 1765 and which was harshly criticised in the intellectual community. Spallanzani replied shifting his engagement from the 'laboratory' to the creation of a 'net' of supporters and led them to repeat the most daring manoeuvres. Apparently, he delegated the destruction of adverse positions, but he skilfully held (...) control of the situation. Such a sharp dissociation between cultural politics and experimental activity was unique in his scientific career. The most numerous group in the net included unknown professors coming from provinces of Lombardy, quite often outsiders in sciences. Spallanzani's correspondence guided their methods and the letters reveal care in managing experiment material, cleverness in questions, awareness of objections, and even a certain amount of creativity. Totally different was the case of two first-rate professionals, the entomologist Giuseppe Rovatti and the physician Michele Girardi. Spallanzani disguised the net as a summation of individuals without an oriented programme. He concealed its most interesting aspect and he himself contributed to frame the view of his isolation in the supposed 'desert' of 18th century Italian sciences. (shrink)