THE FOURTH, FIFTH, AND SIXTH MONTHS. 507 



The skin is more consistent than before, and presents on its 

 surface at certain places small patches of sebaceous matter. 

 Hairs are more extensively developed than before, but are still 

 devoid of any distinct colour. The legs are now longer than 

 the arms, and the nails are well formed. The umbilicus is 

 further forward than in the preceding month, and is now some 

 distance in front of the pubes. 



The head is still very large in proportion to the other parts. 

 The heart, liver, and kidneys are also disproportionately large. 

 The small intestine contains meconium, which, owing to the 

 secretion of bile, is now of a pale greenish-yellow colour. The 

 gall-bladder is of some size. Ossification has commenced in the 

 pubes, and in the os calcis. 



11. The Sixth Month. 



The total length of the foetus at the end of the sixth month, 

 measured from the vertex to the heels, is from 30 to 32 cm. 

 The weight is very variable ; its average amount is about a 

 kilogramme. 



The skin is of a dirty reddish colour, and much wrinkled ; 

 it is covered, at any rate in the axilla) and groins, with a seba- 

 ceous deposit. The hairs are more strongly developed, and of a 

 darker colour than before. Both eyelashes and eyebrows have 

 commenced to appear. 



The umbilicus is still further forward than before, and the 

 meconium in the intestine is darker and more viscous. The 

 testes of the male have not yet descended into the scrotum, 

 but are situated within the abdominal cavity, lying on the psoas 

 muscles, immediately behind the kidneys. 



The sternum is well developed, and has commenced to ossify. 

 The nails reach to the ends of the fingers, and extend about a 

 quarter of the way round them. 



12. The Seventh Month. 



The total length of the foetus at the end of the seventh 

 month, measured from the vertex to the heels, is about 35 or 

 36 cm., and the weight averages about 1^ kilogramme. 



The skin is still of a dirty reddish colour, but not so 

 dark as before. There is an increased deposit of fat in the 

 cellular tissue, causing the body to appear more plump and 



