Paintings, earthworm eggs and their development by Franz [Andreas] Bauer Plate 19 showing details of the sexual organs, eggs, and embryos of the earthworm. Figures 1-4 show the testicle, ovaries, and egg sacks containing eggs and embyros at different stages. Figures 5-9 show immature worms with a dissected view of the tail portion of an adult worm. Various magnifications. Inscribed with publication and plate details. Signed in ink lower left 'Franz Bauer del.' Royal Society stamp verso. Subject: Zoology / Physiology Published in Philosophical Transactions as part of paper titled 'On the double organs of generation of the lamprey, the conger eel, the common eel, the barnacle, and earth worm, which impregnate themselves; though the last from copulating, appear mutually to impregnate one another' by Everard Home. Read to the Royal Society on 27 February 1823. [1823]