Über den Zwischenkiefer des Menschen und der Thiere von Goethe. Jena, 1786. Mit 5 Kupfertafeln.

Goethe believed that in 1784 he demonstrated the presence of the intermaxillary (premaxillary) bone in man, proving an anatomical connection between man and the lower animals, and certifying to Goethe that there is no fundamental difference between man and apes. He was one of the pioneers of evolution and the first to use the term “morphology”. Digital facsimile from the Internet Archive at this link. See George A. Wells, "Goethe and the intermaxillary bone," British Journal for the History of Science, 3 (1967) 348-61. (Available from JSTOR at this link.)