@misc{indiciae09de53ba641a,
  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 23127640},
  year = {1894},
  url = {https://www.biodiversitylibrary.org/page/23127640},
  note = {Source identifier: page-23127640}
}