The  chorea  may  commence  at  any  period  of  pregnancy,  from  the  begin-
ning until  near  the  close,  but  it  begins  more  frequently  in  the  third  than  in
any  other  month,  and  very  rarely  in  the  ninth  month.  Of  thirty-six  attacks^
the  numbers  commencing  in  each  month  were :   1st,  four ;  2d,  three ;  3d,


*  The  figures  are  based  on  an  analysis  of  recorded  and  original  cases;  most  of  the  former
have  been  collected  by  Barnes  {Obstetrical  Trans.,  1869),  but  some  of  his  cases  have  not
been  included,  either  because  insufficiently  reported,  or  because  their  nature  is  open  to  ques-
tion. |  Levick,  Amer.  Journal  of Med.  Sciences,  1862.
%  In  the  statement  in  the  text  those  cases  which  have  been  recorded  as  commencing  when
the  pregnancy  had  existed  for  a  certain  number  of  months  are  considered  as  commencing  in
the  subsequent  "month"  of  gestation.
SYMPTOMS.  961

nine;  4th,  five;  5th,  four;  6th,  four;  7th,  three;  8th,  three;  9th,  one.
