362 Maximilian Herzog. 



as an operative or as a post-mortem specimen.^ He has finally 

 been fortunate enough to obtain a uterus from an absolutely un- 

 objectionable case, containing an ovum, approximately like the 

 Peters' ovum, but including a well-preserved embryonic shield, 

 younger, as it appears, than any human embryo heretofore satis- 

 factorily described. The specimen was obtained in July, 1904, 

 during his term of service as pathologist in the Government Bureau 

 of Science, Manila, P. I. 



The number of very young human ova unobjectionably adapted 

 for a reliable study of the earliest stages of placentation is still 

 exceedingly limited, and it may be said that we have not up to 

 date a single specimen which is ideal and which will compare favor- 

 ably with what can be obtained from the lower animals by timing 

 conception accurately, removing its product from the living, and 

 fixing it at once by the best methods at our disposal. Jung,^ in a 

 recent monograph, to be mentioned more fully below, says in this 

 connection: "The ideal specimen would be a uterus extirpated from 

 a live woman, containing in situ an ovum of the first week after 

 conception. This ovum in situ, after removal from the uterus, 

 should then be treated by aproved technical methods. The uterus 

 itself should be free from those morbid changes which, according 

 to common experience, pathologically alter the implantation of the 

 ovum (myomata, chronic metritis, etc.). We are yet far removed 

 from this ideal. Not a single one of the specimens heretofore de- 

 scribed satisfies even approximately these requirements, and it is at 



'Herzog: Description of an Early Placenta //( ftitii. obtained from the living. 

 The Am. Gyn. and Otist. Journal, April, ISOS, and Transactions Cliieago 

 Patliol. Soc, Vol. Ill, p. 317. 



Herzog: Superfetation in the Human Race. Chicago Medical Recorder, 

 1898, Vol. 15, p. 1. 



Herzog : The Pathology of Tultal Pregnancy. Am. Jour, of Olistet., 1900, Vol. 

 42, No. 2. 



Herzog: Placentation in a Uterus Duplex Bicornis Gravis — Menses 1-2. 

 Trans. Chicago Pathol. Soc, 1904, Vol. 6, p. 51. 



"Jung: Beitriige zur friihesten Ei-Einbettung beim menschlichen Weibe: 

 Berlin, 1908. 



This author has very fully gone into the recent literature of the subject, 

 and I have repeatedly quoted from his monograph. 



