The subject of Ovarian Tumours and their effects is an exceedingly interesting and important one, especially in view of the efforts that are now being spade to elucidate their origin and nature. I have abstracted and epitomised the whole of the literature on Pseudomyxoma Peritonea, and present it here in what I believe to be the only complete and up-to -date account of the subject, in the hope that it may throw some light on this obscure condition, and serve as a foundation for future study. I wish to draw attention to the Histological aspect of my subject, as it in of great importance, especially mentioning in this connection the works of WERTH, WESTPHALEN, STRASSMAIN, GREENFIELD, and others. For the more complete elucidation of the Histology of Pseudomyxoma Peritonea, I have endeavoured to give in full detail the separate accounts of these authorities, adding as opportunities presented themselves, deductions and abstracts of my own, together with a complete original Histological research, carried on by myself, and illustrated by a series of Microphotographs.