364 REPRODUCTION 



Ninth Week.-^Weight, three-fourths of an ounce. 

 Length, one and a quarter inches. Pericardium. Anal ca- 

 nal. External genitals begin to indicate sex. Ovary and 

 testis distinguishable. Kidney characteristic. External ear 

 indicated. 



Third Month. Weight, four ounces. Length, two and 

 three-quarter inches. Chorion frondosum. Placental ves- 

 sels. Tonsil. Stomach rotates. Vermiform appendix. 

 Liver large. Epiglottis. Ovaries descend. Testes in false 

 pelvis. Hair and nails. Development of different parts of 

 brain. Limbs have definite shape. 



Fourth Month. Weight, seven and three-quarter ounces. 

 Length, five inches. Head one-fourth of entire body. Germs 

 of permanent teeth. Distinction of external genitals well 

 marked. Spinal cord ends at end of coccyx. Eye-lids and 

 nostrils closed. 



Sixth Month. Weight, two pounds. Length, twelve 

 inches, Amnion at maximum size. Trypsin in pancreatic se- 

 cretion. Air vesicles. Eye-lashes. Lobule of ear charac- 

 teristic. 



Seventh Month. Weight, three pounds. Length, four- 

 teen inches. Meconium. Ascending colon. Testes at inter- 

 nal rings. Cerebral convolutions evident. Differentiation 

 of muscular tissue. 



Eighth Month. Weight, four to five pounds. Length, 

 sixteen inches. Body more plump. Ascending colon larger. 

 Testes in inguinal canal. Skin brighter color. Nails pro- 

 ject beyond finger tips. 



Ninth Month. Weight, six to seven pounds. Length, 

 twenty inches. Meconium dark green. Testes in scrotum. 

 Labia majora in contact. Spinal cord ends at last lumbar 

 vertebra. Ossification centers completed. 



