152 



THE HUMAN EMBRYO. 



Sixty-] our Days. — Embryo of 32 mm. The specimen (Fig. 91) came with 

 the following history: "January 4, 1886, last flow began; March 13, 1886, abor- 

 tion"; between these two dates are sixty-eight days; but as the flow took place, 

 conception probably occurred after menstruation, therefore if we deduct four 

 days, making the age sixty-four days, we shall probably be not far wrong. It 

 will be noticed that the head has not yet assumed its final angle with the body. 

 On the other hand, the protuberance of the abdomen is much reduced, so that 

 the body as a whole has begun to have a more slender form than in earlier stages. 

 In this specimen the eyelids have not even begun to meet ; in another they have 

 met (Fig. 92), except just in the center, where is still a loophole. This specimen 

 was brought with the statement that it was just sixty days. The endeavor to 



Fig. 92. — Human Embryo of 34 mm. 

 View 01 F vce. ■ 3 diaras. 



Front 



Fig. 93.— Human Embryo of 55 mm. Seventy- 

 five Days. 



get the exact data was unsuccessful. The large size, 34 mm., and advanced 

 development of the embryo lead us to consider the age given as erroneous, and to 

 believe the true age to be perhaps sixty-seven days. 



Seventy-five Days. — Embryo of 55 mm. We figure next (Fig. 93) a foetus 

 concerning which I possess no data. Comparison with embryos of two and three 

 months leads me to place it a little under half-way between them. The specimen 

 has essentially the configuration of the young child ; but the head is very large 

 and the body slender ; the position of the limbs is typical ; the upper arm is bent 

 down, the forearm extends toward the chin; the knee is bent so as to throw the 

 foot toward the median line ; the soles of the feet are placed obliquely facing one 

 another; the anlages of the nails can be recognized on both the fingers and toes. 



