3i6 OF THE GROWTK,&c. 



therefore, has not been fo great as that of the 

 foetus and mafs; but it has received a great 

 augmentation in folidity; it has become pro- 

 portionally thicker than the membranes of the 

 foetus, both of which are now diftinguilhable. 



According to Hippocrates, the male foetus 

 expands fooner than the female. 



At the end of fix weeks, the foetus is about 

 two inches long, and the human form begins to 

 be more p^rfetft, only the head is very large in 

 proportion to the other parts of the body. A- 

 bout this time the motion of the heart becomes 

 vifible : In 50 days, the heart has been perceived 

 to beat for a confiderable time after the foetus 

 was extraded from the uterus. 



In two months, the foetus is more than two 

 inches in length; and the oflitication is per- 

 ceptible in the middle of the two arm-bones, in 

 the thigh and leg, and in the point of the under 

 jaw, which is then greatly advanced before the 

 upper. Thefe, however, are only olleous points. 

 But, by means of a quicker growth, the clavi- 

 cles are entirely oflified : The umbilical cord is 

 formed, and the veffcls which compofe it begin 

 to twift like the threads of a rope: But this 

 cord is very Ihort in comparilon of the length 

 it afterwards acquires. 



In three months the foetus is nearly three 

 inches long, and weighs about three ounces. 

 Hippocrates afferts, that at this time the motions 

 of the male foetus begin to be felt by the mo- 

 ther ; 



