HEALTH  PRECAUTIONS  371
munities  where  there  is  a  large  percentage  of
Indian  population,  but  this  need  not  be  a  cause
for  worry  if  one  is  vaccinated.  A  popular
South  American  hotel,  having  had  many  cases
of  this  disease  among  its  patrons,  has  hanging
in  each  room  this  sign:—
“Rooms  disinfected  when  guests  leave,”
in  order  to  inspire  confidence  in  its  new  clients.
This  sign  might  have  as  a  companion,  another
one  displayed  in  a  leading  Latin  American
hotel,  reading:—
“Guests  are  requested  not  to  spit
through  the  mosquito  netting.”
Yellow  fever  always  exists  in  many  of  the
towns  of  Ecuador,  Colombia,  Venezuela,
Brazil  and  most  of  the  Mexican  and  Central
American  ports.  It  is  due  to  the  bite  of  a
certain  species  of  mosquito.  By  observing
precautions,  such  as  sleeping  under  a  net  and
staying  away  from  districts  known  to  breed
these  insects,  the  chances  for  contracting  this
disease  are  materially  minimized.
That  bubonic  plague  is  present  in  many  lo ­