Change of Structure in the human Ovarium . yy 
probably a preparatory ftep to the formation of hair. All this 
fhews moft clearly, that hair may be formed without any 
Ipecies of generation as it is commonly underftood. 
But hair is in itfelf as diftindt a confequence of generation as 
teeth, and as much a peculiar fubftance. If then the one be 
formed, there appears to be no reafon why the other fhould 
not alfo be formed. The adtion producing the one is not 
better underftood than that producing the other ; nor does it 
appear to be really in itfelf lefs connedted with that fpecies of 
generation arifing from the approach of a male, fo that teeth 
may probably be formed by a peculiar adtion taking place 
in the ovarium itfelf, as well as the hair. 
It will tend to add further weight to this opinion, to con- 
fider that many of the adult teeth are formed in a child after 
birth ; and therefore their formation depends on an adtion 
taking place in the jaws at a particular period, and not on 
original growth. The fame circumftance ftrikes more ftrongly 
in the occafional formation of teeth at an advanced time of life* 
Both of thefe procefl'es take place after the animal has been 
formed, in confequence of a certain adtion being excited in a 
particular part of the body, and therefore there is lefs difficulty 
in believing that the fame fort of procefs may go on in another 
part of the body not commonly employed in it. It feems reafona- 
ble alfo to fuppofe, that the ovaria ffiould have a greater aptitude 
of taking on a , procefs fomewhat fimilar to generation than 
the other indifferent parts of the body, as they conftitute a part * 
of the organs which are fo materially concerned in the real ■ 
procefs itfelf Thefe circumftances, when taken colledtively, 
would l 
* As the formation of teeth, and hair involved in a fatty mafs may be faid to 
be peculiar to the ovaria, and as there are ftrong reafons for believing, that this 
formation 
