Formation of the human foetus: five figures, showing the development from embryo at conception, to foetus of four months gestation. Colour engraving by J. Pass after D. Dodd, 1794.

"This first visible state of conception, which resembles the lucid appearance of a drop of water, tending to coagulation, is correcly shewn in the first figure of the annexed plate, precisely in the state it was extracted from the uterus of a female, who died on the sixth day after contact with the male, and is now to be seen, preserved in spirits, in Rackstrow's valuable Museum, in Fleet-street, London."--Sibly, op. cit., p. 56