EXPLANATION OF PLATES. 



I'l.ATi; 1 . 



Figs. 1,2. Pliotograplis of the two lialvcs of ovum \o. 004. Natural sizo. Tho cavity of the ovum is lillcil witli a 



jelly-like substance in which a i)athological embryo is embedded. 

 Fig. 3. Section through a normal ovum Xo. 836, encajwulated in the decidua. X'-i\. Drawn by Mr. Ditlusch. 

 The embryo lies witliin the ccrlom, and hands of mapma fibrils radiate from the amnion to the chorionic 

 wall. The head of the embryo shines through the more transparent portion of the amnion. 

 Fig. 4. Photosra|)h of a block of the ovum, Xo. 830, in »ilu after the embryo had been removed. X22. The 



supporting strands of magma are strikingly shown. 

 Fig. 5. Pathological embryo Xo. 1117, embedded in hyaline magma. X4. From a tubal pregnancy following 

 gonorrhea (?). 

 Pathological ovum X'o. 560, containing a great quantity of reticular magma. X2j. The embryo is 



normal in form. From a case of retroversion of the uterus. 

 Pathological ovum Xo. 991, with the cavity completely filled with reticular magma. Xatural size. The 

 embryo is normal in form. From a negro woman. Sect ions of the embryo indicate that it is macerated. 

 Pathological ovum Xo. .")31, containing a granular deposit around a nodular embryo. Xlj. 

 Pathological o\um with a nodular embryo (G.^lg). X2. The exoco-lom is gorged with p;ranular magma. 

 Specimen Xo. 630. X21. The embryo and chorion are normal in form, but the reticular magma is 

 markedly increased in quantity. 



Pl.vte 2. 



Fig. 1. Pathological embryo Xo. 512, lying free within the ovum. XO. The villi arc thin and scattered and the 



embryo is atrophic. There is no formed magma. 

 An o\-um, Xo. 570, obtained from tubal i^regnancy, showing a delicate layer of magma fibrils around the 



attachment of the umbilical cord to the chorion. X3. 

 Ovum Xo. 533, showing very extensi\c magma. X6. 



Pl.ate 3. 



Ovum Xo. 545. X7. There is a delicate network of fibrils below the amnion and the chorion. 



Embryo Xo. 588. XS. Delicate strands are shown radiating from the umbilictil cord and yolk-sac. 

 This figure is given to show the appearance of magma in vesicle de\-elopment. From a woman who has 

 had numerous mechanical abortions performed upon herself. Uterus badly inflamed. 



Section through the chorion and magma of Xo. 402. X2S0. The specimen was stained with Van Gieson 

 stain and shows that the fibrils of the magma are continuous witli those of the mesenchyme of the chori- 

 onic wall. It came from a case with subinvolution and symptoms of endometritis. 



Outline of the ovum of Xo. 000. Xatural size. The diagram indicates the part of the specimen shown 

 enlarged in figure 5. 



Xo. 000, showing very extensive changes in the magma. XO. The upper tip of the amnion is shown. 

 The magma is fibrillar and granular, and at places the fibrils seem to form membranes. The chorionic 

 wall is very hemorrhagic. 



