154 



THE HUMAN EMBRYO. 



embryo Ltz, of which he fixes the probable age as just over seven weeks. The 

 head is nearer its final position than in figure 103, and relatively larger in propor- 

 tion to the body, In the eye, cornea and conjunctiva are clearly separated; the 

 face has the fetal form, the nose, mouth, and chin being fully marked off. The 

 arms are clearly divided into upper and lower segments; the five digits are well 

 developed; the hands rest over the heart and nearly touch one another. The leg 



FIG. 106. HUMAN EMBRYO OF 22.8 MM. SERIES 871. X 5 diams. 



shows the triparite division; the toes are just beginning to be free, but the hind- 

 limb is much less advanced than the fore-limb. The tail is still a freely projecting 

 appendage. 



Embryos of Fifty-three Days, 22-23 mm - The specimen (Fig. 106) is probably 

 quite normal. As compared with the last stage, there are comparatively few changes 

 of external form; the most noteworthy are perhaps the increased development of the 

 legs and feet and the commencing disappearance of the free tail. At this time the 



