@misc{indiciae0c0bbfcbd5a2,
  title = {Principles of comparative physiology / Principles of comparative physiology. : [Supplementary material in Charles Darwin's copy] — Illustration, Page 52},
  year = {1854},
  url = {https://www.biodiversitylibrary.org/page/34067912},
  note = {Source identifier: page-34067912}
}