Plate 17 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 belly 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 brain and nervous system, intestine and sexual organs, x4 magnification. Inscribed with publication and plate details. Signed in ink lower left 'Franz Bauer del.'Original: watercolour on board. 1823