We  deemed  the  differences  worthy  of  record,  however ;  to  be
given  such  weight  as  their  limited  character  would  justify.  As
to  the  class  of  individuals  tested:  they  were  almost  entirely
students  of  the  University  of  Kansas,  a  co-educational  institution
of  fair  grade,  which  at  that  time  contained  nearly  equal  numbers
of  young  men  and  women.  Ages  chiefly  17  to  25  years.  The
.  only  distinction  which  one  could  draw,  other  than  sexual,  -was
that  which  arises  from  the  fact  that  boys,  in  an  institution
offering  a  considerable  choice  of  studies,  select  the  sciences
rather  than  letters,  gaining  thereby  some  training  of  the  special
senses.  The  few  cases  in  which  we  deemed  it  certain  that
training  entered,  were  those  of  students  of  pharmacy  who  had
been  given  much  practice  in  the  recognition  of  drugs,  etc.,  by
use  of  the  unaided  senses,  touch,  taste,  smell,  etc.  We  did  not
think  male  observers  perceptibly  affected  by  indulgence  in
tobacco  or  alcohol.  The  use  of  either  was  the  exception,  and
attempts  to  take  account  of  the  influence  of  such  habits  by
averaging  smokers  and  non-smokers,  etc.,  seemed  to  show  no
effect.     To  sum  up  then: —

"  The  class  dealt  with  was  in  one  way  a  special  one  (college
students).
"  There  was  no  attempt  to  select  within  that  class;  nor  to
exclude  smokers,  etc.
"The  experiments  were  not  conducted  with  a  view  to  sexual
-differences.
