At Strassburg began his intimacy with Caspar Schwenkfeld, a congenial spirit.
It is a striking example of the difficulty of getting people to use their own powers of investigation accurately, that this form of the doctrine of evolution should have held its ground so long; for it was thoroughly and completely exploded, not long after its enunciation, by Caspar Frederick Wolff, who in his Theoria generationis, published in 1759, placed the opposite theory of epigenesis upon the secure foundation of fact, from which it has never been displaced.
This point of view was further developed in the following century by Caspar Friedrich Wolff (Theorici generationis, 1759), who first followed the development of the members at the growing-point of the stem.
He ineffectually resisted the efforts of the Calvinists, led by Caspar Olevianus, to introduce the Presbyterian polity and discipline, which were established at Heidelberg in 1570, on the Genevan model.
Nevertheless the book was eagerly sought, and several editions of it appeared.4 Mention must be made of a medical treatise by Caspar Schwenckfeld, published at Liegnitz in 1603, under the title of Theriotropheum Silesiae, the fourth book of which consists of an " Aviarium Silesiae," and is the earliest of the works we now know by the name of fauna.