Plate 16 from the paper 'On the double organs of generation of the lamprey, the conger eel, the common eel, the barnacle, and the earthworm, which impregnate themselves; though the last from copulating, appear mutually to impregnate one another', by Everard Home, Philosophical Transactions of the Royal Society, vol.113 (1823), pp.140-151. Figure 1 shows a back view of the earthworm, x2 magnification; figure 2 shows the same worm under dissection, x2 magnification; figure 3 is the upper portion of the same, showing details of the arteries, ovaries and testicles, x4 magnification. Inscribed with publication and plate details. Signed in ink lower left 'Franz Bauer del.'Original: watercolour on board. 1823