@misc{indiciaea4271c44bd67,
  title = {Investigations on microscopic foams and on protoplasm; experiments and observations directed towards a solution of the question of the physical conditions of the phenomena of life — Illustration, BHL page 23127331},
  year = {1894},
  url = {https://www.biodiversitylibrary.org/page/23127331},
  note = {Source identifier: page-23127331}
}