It  makes  no  difference  in  the  final  result  whether  the  fatty  acid
be  dried  only  one  and  one-half  hours  or  a  much  longer  time.  It-
is  also  immaterial  whether  the  dried  fatty  acid  be  used  immediately
for  the  determination,  or  whether  it  be  first  allowed  to  solidify  and
to  stand  a  long  or  short  sime,  being  subsequently  remelted  for  the
determination.
Wolfbauer  showed  that  the  diameter  of  the  tube  may  be  in-
creased from  3^  centimeters  without  disturbing  the  ratio  between
the  amount  of  heat  radiating  from  the  fatty  acid  through  the  walls
of  the  tube  and  the  amount  of  liberated  latent  heat.  Consequently
a  tube  3^  centimeters  or  more  in  diameter  answers  perfectly  for  the
correct  determination  of  the  freezing-point,  but  it  is  not  permissible
to  use  one  appreciably  narrower  than  this.
