18. Ovum coriaceum, cum hydrope funis et placentâ hydaticâ. 19. Ovum cum placentâ, nec vasculare nec plene cotyledonica, sed filiforme. Amnion morbosum. 20. Ovum tuberculosum. 21. Ovum pane solidum. Placenta sarcomatosa cum tuberculis. Involucra fœtüs solidificata. 22. Ovum cum involucris internis ab amnio-chorionitide condensatis. 23. Ovum fœtiferum optimè conditum, subitò, ab amnio-chorionitide interfectum. 24. Ovum fœcundum in receptaculo Ovarico. 25 and 26. Ovum fœcundum in receptaculo Tubico. 27 and 28. Ovum fœcundum in receptaculo Interstitiale. 29. Ovum fœcundum in receptaculo Ovarico. 30. The sac of the preceding Ovum laid open. 31. Membrana pseudo-textilis intro-uterina bi-tubulata. 32. Membrana pseudo-textilis intro-uterina sine tubulis. 33. Coagulum intro-uterinum hæmatosum pseudo-membranaceum incavum. 34. Coagulum intro-uterinum hæmatosum laminare cavum. 35. Coagulum intro-uterinum spongiosum cavum, interne velatum. 36 and 37. Coagulum intro-uterinum, interne solidum, externe membranaceum. 38. Mola avellana tunicata. 39. The same laid open. 40. Mola avellana nuda. 41. The same laid open. 42. Mola conchula. 43. The same laid open. 44. Mola Mytilus. 45. The same laid open. N. B. In the last Plate, the figures 2 and 3 should be reversed, in order to correspond with the text or printed explanations. ADVERTISEMENT. I submit to my professional friends and acquaintances, as well as to all those medical brethren who take an interest in the progressive advancement of the sciences they cultivate, a series of beautifully executed Drawings of anatomical preparations, intended to explain and illustrate the important subjects of “Abortion”, and “The Diseases incidental to Menstruation”; subjects in which all classes of the medical profession, whether specifically devoted or not to obstetrical practice, are equally interested. The drawings speak for themselves. The Artist, under my immediate and constant superintendence, and with the anatomical preparations in every case before him, explained and demonstrated to him, has, in the course of six years, been able to produce twelve plates, containing upwards of forty anatomical figures, lithographed and coloured by himself, which reflect no small honour on the arts of this country, and are highly creditable to his abilities. These plates, I will venture to say, leave nothing to be desired in such a mode of representing anatomical subjects, (a mode which appears from the present endeavours to be the best calculated of any for that purpose,) whilst they remove every cause of regret, hitherto entertained, that the most successful efforts of anatomical lithographic representation, of which foreign countries can boast, had never yet been equalled in England. It may now be asserted that those efforts have been triumphantly rivalled by Mr. Joseph Perry on the present occasion; and,