, Archaeopteryx'' and a
pigeon Heilman published an English revision of his series of Danish papers in 1926 as
The Origin of Birds. despite the discovery of clavicles in the primitive theropod
Segisaurus in 1936. Clavicles and even fully developed furculae have since been identified in numerous other non-avian dinosaurs. In 1912 he contacted
Adolf Herluf Winge at the Zoological Museum in Copenhagen. Winge had initially shown some interest in his work but was not particularly helpful. Winge's short responses to an eight-page letter of queries and ideas caused much irritation and Heilman decided to stop writing to him. Heilman later noted that Winge was a Lamarckist, and from that point he worked alone without communication with Danish academics. He sent a short paper in Danish in 1912 and this was accepted by the editor Otto Helms. Helms was attacked by numerous Danish academics for allowing it to be published. A letter from the Danish zoologist
R. H. Stamm to Helms read:
May I offer my condolences as to the latest issue? It must have been rough on you – who must know birds well, and as a medical doctor must possess some general sense of natural history – to include in the journal the dilettantish mess which occupies most of the issue. His first paper published in the Danish ornithology journal was however discovered by American paleontologist
R. W. Shufeldt, who was able to make sense of it thanks to help from his Norwegian wife. This opened up Heilman to connections outside Denmark. His work was introduced to
D'Arcy Thompson by R. W. Shufeldt and this led to the two exchanging ideas on morphological evolution. His past bitter encounters with Danish academics led to Heilman initially writing "
I wonder why Dr. R.W. Shufeldt has written to you about my work; he ought to have told you, that I am an artist and only an incipient amateur in science. This is my first work in this line." In the course of his interactions with Thompson, he also contributed some illustrations for use in "On Growth and Form". In 1940, Heilmann published a second book on
Darwinian evolution, the
Univers og traditionen (
Universe and Tradition, in Danish). He also expressed his sentiments against religious beliefs in this book. The bird-like
dinosaur species
Scansoriopteryx heilmanni was named in honour of Gerhard Heilman in 2002. ==Notes==