71 
Rio  Grande  do  Norte . 
.  44 
examinations  3  positive . 
. .  6,81  o/0 
Parahyba  do  Norte . . 
.  57 
« 
3  «  . 
.  5,26  o /„ 
Pernambuco . . 
C 
30  «  . 
.  32,25  o/o 
Sergipe . 
.  75 
« 
23  «  . 
.  30,66  o/o 
Bahia . 
....  42 
« 
12  «  . 
.  28,57  o/o 
At  first  sight  already,  one  notices  the  dif¬ 
ference  between  the  States  of  Rio  Grande  do 
Norte  and  Parahyba  on  one  side,  and  the  rema¬ 
ining  States  on  the  other,  as  regards  the  per¬ 
centage  of  bearers  of  Schistosomum.  On 
account  of  this  we  stayed  only  a  short  time 
in  the  former  states  and  gave  most  of  our 
time  to  the  latter,  specially  to  Pernambuco  and 
Sergipe  as  more  favourable  to  our  studies 
and  hardly  investigated  before.  We  almost 
expected  this  beforehand  as  the  examinations 
of  specimens  furnished  by  the  patients  of  the 
Marine  Hospital,  had  always  shown  the 
greatest  percentage  of  bearers  of  eggs  of 
Schistosomum  among  individuals  come  from 
Pernambuco,  Sergipe  and  Bahia. 
None  of  the  examined  specimens  was 
entirely  free  from  worm  eggs,  excepting 
those  from  4  members  of  a  familv,  come  to 
Aracaju  only  4  months  before  from  the  South 
of  Brazil.  As  to  the  frequency  of  eggs  of 
the  several  species  of  worms  found  in  feces, 
the  order  is  as  follows  :  7°  Ankylostoma,  2 o 
Trichocephalus,  3o  Ascaris,  4o  Schistosomum , 
mansoni,  many  specimens  showing  eggs  of 
all  4  species;  these  cases  we  called  “poly¬ 
valent’'. 
Plague. 
On  arriving  at  Recife,  we  were  invited 
to  visit  the  Isolation  Hospital  of  Santa 
Aguida,  where  patients  suffering  from  dy¬ 
sentery  were  received  :  here  we  looked  out 
for  cases  of  infection  by  amoebae  and  Schis¬ 
tosomum.  We  were  shown  two  cases  consi¬ 
dered  suspect  of  plague,  one  almost  cured  and 
the  other  one  much  improved.  From  the  lattei, 
we  withdrew  some  pus  of  a  bubo,  which  on 
examination  proved  sterile  ;  this  result  favours 
the  diagnosis  plague.  While  going  down  the 
São  Francisco  we  were  told  of  cases  suspect 
of  plague,  in  Villa  Nova  (Sergipe),  on  the 
banks  of  the  same  river.  By  very  circum- 
stancial  and  often  repeated  information,  we  fee! 
sure  that  it  really  was  plague,  some  of  the 
cases  even  showing  the  pulmonary  form. 
Later  on,  our  suspicions  were  confirmed  by 
information  obtained  from  two  doctors,  ap¬ 
pointed  by  the  Government  of  Sergipe  to 
study  this  epidemic.  After  our  return  from 
Rio  Grande  do  Norte  to  Recife,  we  found 
in  the  same  hospital,  four  typical  cases  of 
plague,  in  which  all  the  circumstances  justifying 
the  diagnosis  of  epidemical  plague,  were  pre¬ 
sent. 
All  the  patients  came  from  the  same  part 
of  the  city,  from  neighbouring  houses,  (where 
a  few  dead  rats  had  been  found,)  except  one 
who  came  from  another  part  of  the  city  ; 
he  had,  however,  shortly  before  passed  a 
night  in  one  of  the  above  mentioned  houses. 
It  was  not  the  first  time  that  cases  with  s  - 
miliar  symptoms  had  occurred  in  this  place. 
The  laboratory  researches  also  confirmed  the 
clinical  diagnosis.  On  our  way  to  Caruani 
in  the  South  of  the  State  of  Pernambuco,  in 
a  place  called  Gonçalves  Ferreira,  where  we 
looked  for  Planorbis  and  patients  suffering 
from  schistosomatosis,  we  were  told  that  some 
kilometers  away  some  people  had  died  with 
buboes  in  the  inguinal  and  axillary  regions; 
their  death  was  preceeded  by  the  finding  of 
dead  rats.  At  first  we  intended  to  verify  the 
exactness  of  this  information,  in  loco,  but 
gave  it  up,  as  we  were  told  that  there  were 
no  more  patients. 
Yellow  fever. 
As  to  the  presence  of  yellow  fever,  we 
invariably  got  negative  information  even  in 
Alagoas.  We  left  however  convinced,  that 
cases  of  yellow  fever  had  occurred  or  were 
occurring.  From  time  to  time,  a  doctor  spoke 
to  us  in  undecided  terms  of  suspect 
cases,  but  immediately  tried  to  divert  sus¬ 
picion  by  affirming  that  the  disease  was 
