2§8 OF THE FORMATION 



liar to the fexual parts of the other individual, 

 they muft arrange themfelves in the form of an 

 organized body, but not in the form of another 

 foetus ; becaufe their pofition with refpedt to 

 each other has been changed by the different 

 movements of the particles which entered into the 

 compofition of the firft foetus. From the union 

 of thefe fuperabundant particles, therefore, an- 

 irregular body muft arife, which will refemble 

 the foetus in nothing but its growth and expan- 

 fion, becaufe, though this body be compofed of 

 the fame organic adive particles with the foetus, 

 their pofition and form muft be different, as they 

 were thrown afide from the centre or point of 

 union, which ferved as a bafis for the formation 

 of' the foetus. 



When the quantity of feminal fluid of both in- 

 clividuals is great, or, rather, when thefe liquors 

 abound with organic particles, different centres of 

 atiradion are formed in different parts of the mix- 

 ture'; ktidj in that cafe, by a mechanifm fimilar 

 to what lias been mentioned above, feveral foetufes 

 are formed, fome of them males, and others fe- 

 males, according as the particles of the one fex or 

 of the other are moft adtive. But, from the fame 

 centre of attraction, two foetufes can never ori- 

 ginate; becaufe two centres are requifite for this 

 purpofe. Befides, if this arrangement were to 

 happen, no particles would be left for the for- 

 mation of the placenta and membranes; becaufe 

 they would all be employed in conftituting the 



fecond 



