THE  CELL  93

I  must  here  explain  to  the  reader  more  about  the  repro-
ductive cells  of  plants  and  animals, — how  they  differ  from
those  cells  that  build  the  body.  They  are  called  germ
cells  and  as  you  remember,  the  male  cell  is  called  the  sper-
matozoon and  the  one  that  comes  from  the  female  is  called
the  egg.  However,  the  reader  must  not  forget  that  the
egg  and  spermatozoon  are  cells,  in  every  way  just  alike,
except  that  they  are  built  and  prepared  to  perform  differ-
ent kinds  of  work  and  for  that  reason,  they  look  different.
