As such are to be reckoned all those foreign bodies reputedly or really, accidentally or designedly, conveyed upon or into the human body; but which are proved either not to infest it in reality, or to be of a nature even manifestly to preclude a parasite existence.

We have to bring into this account not alone animal creatures, and various parts of animals and of plants; but also misshapen, diseased tex-tural parts of the organism, or products of disease. Such are:

1. Animals and parts of animals dead or alive, really voided by stool or rejected by vomiting, such as the larvae of flies received into the stomach with food in a state of decomposition, or accidentally or designedly added to the matter so evacuated.

2. A great variety of other bodies of the descriptions adverted to. Amongst the spurious parasites of the present day we may cite - (a.) The trichomonas vaginalis of Donne, - probably a misshapen ciliary cell.

(5.) Diceras rude (Rudolphi), repeatedly recognized as the undigested seeds of mulberries.