ANIMALS. 381 



chin, the under jaw being greatly advanced be- 

 fore the upper. These parts, however, may as 

 yet be considered as bony points, rather than as 

 bones. The umbilical vessels, which before went 

 side by side, are now begun to be twisted like a 

 rope, one over the other, and go to join with the 

 placenta, which as yet is but small. 



In three months, the embryo is above three 

 inches long, and weighs about three ounces. 

 Hippocrates observes, that not till then the mo- 

 ther perceives the child's motion ; and he adds, 

 that in female children, the motion is not obser- 

 vable till the end of four months. However, this 

 is no general rule, as there are women who as- 

 sert, that they perceived themselves to be quick 

 with child, as their expression is, at the end of 

 two months ; so that this quickness seems rather 

 to arise from the proportion between the child's 

 strength and the mother's sensibility, than from 

 any determinate period of time. At all times, 

 however, the child is equally alive ; and, conse- 

 quently, those juries of matrons that are to de- 

 termine upon the pregnancy of criminals, should 

 not inquire whether the woman be quick, but 

 whether she be with child ; if the latter be per- 

 ceivable, the former follows of course. 



Four months and a half after conception, the 

 embryo is from six to seven inches long. All 

 the parts are so augmented, that even their pro- 

 portions are now distinguishable. The very nails 

 begin to appear upon the fingers and toes ; and 

 the stomach and intestines already begin to per- 

 form their functions of receiving and digesting. 



