374 
Liverpool  and  Paris.  We  publish  a  series  of  photographs  illustrating 
the  morphology  of  this  trypanosome  (Plate  III,  figs,  i,  2,  3  and  4). 
The  impracticability  of  maintaining  this  strain  is  much  to  be 
regretted  ;  it  is  possible  that  it  may  be  again  recovered  at  or  near 
Broken  Hill. 
Transmission  of  the  Cattle  Trypanosomes,  pp.  128-131. 
In  the  present  report  we  are  able  to  adduce  further  evidence  to 
corroborate  our  view  that  Stomoxys  was  responsible  for  transmission 
in  the  Broken  Hill  herd,  which  had  not  been  exposed  to  Glossina. 
It  may  be  recollected  that  two  healthy  oxen  were  exposed  to 
Glossina  rnorsitans  on  the  road  from  Mwomboshi  to  Broken  Hill,  and 
that  only  three  flies  were  seen  to  feed.  Both  these  animals  became 
infected  on  the  eighteenth  day  with  T .  vivax.  Respectively  seven 
and  eight  days  later  they  showed  an  organism  morphologically 
identical  with  tadpole  T .  dimorfhon. 
It  is  most  undesirable  that  this  crude  observation  should  be  cjuoted 
as  evidence  of  the  infectivity  of  Glossina.  Although  these  cattle 
were  kept  by  themselves  on  arrival,  they  were  not  in  fly-proof 
stables,  and  the  possibility  that  they  were  attacked  by  Stomoxys 
on  the  farm  cannot  be  excluded ;  indeed,  the  occurrence 
of  a  double  infection  would,  a  priori,  indicate,  especially  in  Case 
XLIV  (one  G.  rnorsitans  seen  to  feed),  that  Stomxys  should  be 
incriminated.  We  would  further  point  out  that  the  diagnosis  of  the 
trypanosomes  in  these  animals  is  based  solely  on  the  morphological 
appearances,  and  that  no  sub-inoculations  were  made.  It  will 
therefore  be  apparent  that  this  also  is  open  to  grave  question,  and 
that  the  so-called  double  infection  may  in  reality  be  but  a  manifesta¬ 
tion  of  morphological  variation  in  a  single  species,  such,  for  example, 
as  Wenyon  and  ourselves  have  noted  in  T .  nanum. 
