* 
AmMayr;i9ohifrm-}  Animal  Parasites  in  Man.  229 
of  deaths  occurring  in  tropical  districts,  and  is  of  especial  interest 
since  Surgeon  B.  K:  Ashford  (United  States  Army1)  has  shown  it  to 
be  most  common  in  Porto  Rico,  and  other  of  the  West  Indies. 
Tape  Worms. — Segments  of  these  parasites  are  commonly  passed 
with  the  stool,  and  their  study  and  general  characteristics  differ  in 
no  way  from  where  the  parasite  is  expelled  as  a  result  of  thera- 
peutic measures.  The  freshly  voided  segments  are  first  washed  in 
water  and  then  placed  in  70  per  cent,  alcohol  for  twenty-four  hours, 
when  they  are  transferred  to  xylol  for  twenty-four  hours  and  then 
mounted  as  follows:    A  portion  of  a  segment  is  placed  on  a  slide, 
Fig.  i. — Anchylostoma  duodenale.    (1)  Natural  size;  (2)  head  and  neck  (B. 
U,  %)\  (3)  tail  (B.  L.,  %);  (4)  ova  (B.  L.,  /6). 
and  teased  to  shreds.  After  a  short  exposure  to  the  air  (five 
minutes)  a  drop  of  Canada  balsam  is  added  and  on  it  a  coverglass 
placed.  Prepared  in  this  manner  the  ova  are  readily  seen  through 
a  ft  lens,  and  when  viewed  under  a  y§  lens,  both  their  outline  and 
and  structure  are  apparent.  Staining  is  accomplished  by  Dela. 
field's  hematoxylin  and  other  dyes,  but  adds  little,  if  anything,  to 
the  specimen's  value.  Study  of  the  segment  in  its  entirety  is  most 
interesting,  but  scarcely  necessary  in  clinical  work.  It  may  be  accom- 
plished by  placing  a  segment  between  two  slides  and  clamping  them 
lNew  York  Med.  Jour.,  April  14,  1900. 
