THE HISTORY OF ANATOMICAL SCIENCE 327 



germ-cells may remain unchanged, and become 

 included in that body, which has been composed 

 of their metamorphosed and diversely combined 

 or confluent brethren ; so included, any derivative 

 germ-cell, or the nucleus of such, may commence 

 and repeat the same processes of growth by imbi- 

 bition, and of propagation by spontaneous fission, 

 as those to which itself owed its origin ; followed 

 by metamorphoses and combinations of the germ 

 masses so produced which concur to the develop- 

 ment of another individual ; and this may be, or 

 may not be, like that individual in which the 

 secondary germ-cell or germ-mass was included.' 



Again (p. 72) :— 



' It would be needless to multiply the illustra- 

 tions of the essential condition of these pheno- 

 mena. That condition is, the retention of certain 

 of the progeny of the primary impregnated germ- 

 cell, or, in other words, of the germ-mass, un- 

 changed in the body of the first individual 

 developed from that germ-mass, with so much of 

 the spermatic force inherited by the retained 

 germ-cells from the parent cell or germ-vesicle as 

 suffices to set on foot and maintain the same 

 series of formative actions as those which consti- 

 tuted the individual containing them. 



' How the retained spermatic force operates 

 in the formation of a new germ-mass from a 

 secondary, tertiary, or quaternary derivative germ- 

 cell or nucleus, I do not profess to explain ; 



