The museum connected with King’s College contains at least a dozen good specimens of liver hydatids, several of the cases being of special interest from a pathological point of view. There are two remarkably fine examples of hydatids contributed by Dr Hooper, the parasites in one case affecting the spleen, and in the other involving the ovary and uterus. The spleen contained numerous encysted hydatids, whilst the uterine organs exhibited “an immense collection” of the same growths. In this place, also, I may refer to an hydatid-like entozoon, taken from a cyst in the ovary of a female who had been under the care of Dr Johnson (1860). It is, apparently, a genuine example of the slender-necked hydatid (_Cysticercus tenuicollis_); and if so (as might be determined by dissection), is, so far as I aware, the only specimen of the kind in existence from the human bearer. There is a renal hydatid (presented by Dr Pass, of Warwick) which was obtained from a lunatic, its presence being “quite unsuspected during life.” Amongst the liver cases (the majority of which are from Dr Hooper’s collection), there is one enormous hydatid that was obtained from a young woman who had died during a fit of laughter. The tumour had pushed the diaphragm up to a level with the fourth rib; and it is stated that, on puncturing the cyst, the fluid contents were ejected “in a jet nearly two feet high.” There is one case represented where numerous hydatids were expectorated after hepatitis, whence it was concluded that they were originally connected with the liver. There is a large solitary hydatid that was removed from a young female who died of phthisis, and in whom the consequent swelling had formed in the neighbourhood of the navel. Especially instructive, also, from a clinical point of view, is a case of peritoneal hydatids where the tumours had been diagnosed to represent a case of extra-uterine fœtation. It appears that there were two cysts, one of them being connected with the uterus. Two of the enormous hydatids taken from these cysts are preserved in the collection of the Anatomy School of Oxford. Several of the preparations show to perfection the stages of natural cure produced by calcareous degeneration; and there is one liver showing three of these so-called ossified cysts. The disease in this case proved fatal. Most of the entozoa displayed in the Charing Cross Hospital Museum have been contributed by Dr Wiltshire, the series being particularly strong in tapeworms. There are four characteristic examples of hydatids of the liver, representing as many separate cases. Two were from abscesses of this organ. In one of these, Mr Canton’s case, the hydatid was, I believe, expelled after operation; but in the other example (presented by Mr Rose, of Swaffham) the parasite was evacuated from an abscess, which burst of itself, externally.