Fig. 24. — Photomici'ograph from section No. 125. Zeiss, plauar, x 15 diarn. 

 (approximately). This photomicrograpli sliows tlie relation of tlie ovum to 

 the parts where it has implanted itself. It is separated from the surface 

 by a very thin capsularis and in the middle of the upper margin of the 

 photograph may be seen a place where the chorion mesoderm is adherent 

 in the form of a teat-like projection to the capsularis, which is defective 

 at this place. The open ring seen a little to the right of the center of 

 the chorion cavity (exocoelom) is a transverse section of the yolk sac 

 which hangs down beyond the end of the embryonic shield. The chorionic 

 mesoderm is surrounded by the ti'ophoblast. The ovum rides as it were on 

 a wedge-shaped group of enormously, cystically, enlarged gland spaces, and 

 lacunae, filled densely with maternal blood. To the right and to the left 

 are seen the enlarged glands of the uterine mucosa. Differentiation into a 

 decidua spougiosa and compacta is not well seen in this section. At the 

 left lower corner there is a strip of the muscularis. 



Fig. 25. — Photomicrograph from section No. 153. Zeiss, planar, x 29 

 diam. Showing the chorionic cavity filled with a coagulated granular mate- 

 rial. To the right is seen the embryo anchored by the allantoid stalk 

 to the chorion mesoderm. In the upper coi'ner a thin strip of degenerated 

 decidua capsularis. 



Fig. 26. — Photomicrograph from a section outside of the implanted ovum 

 (from first series of sections, unnumbered), Zeiss, planai*, X 15 diam. 

 Showing large cystic gland spaces partly filled with blood. To the left a 

 differentiation into a decidua compacta and spongiosa is well marked. 

 The lower margin of the photomicrograpli sliows the muscularis uteri. 



Fig. 27. — Photomicrograph from section No. S3. Zeiss Apochromat. 8 mm., 

 proj. occ. No. 4, X 210 diam. Gland spaces near the ovum filled with 

 spherical hyaline masses. 



