ANovemberfhia9ri^'  )     Detection  of  Dextrose  in  Urine.  719 
Strength  of 
Dextrose 
Sol.  (Per- 
centage). 
Phenyl- Hydrazine  Test. 
Fehling's  Test. 
Nylander's  Test. 
0.5  
Positive  before  cooling. 
Positive  while  hot. 
Positive  (black  coloration). 
O.25  .... 
Positive  (brown  coloration) . 
0.125  .  .  . 
Positive  (light  brown  color- 
ation). 
O.0625  .  . 
after  " 
Positive  (very  light  brown- 
ish). 
0.06  .... 
"         "  " 
<<         tt  „ 
Negative. 
O.O3125  . 
O.OI56  .  . 
after  standing. 
O.OI  .... 
O.OO9  .  .  . 
0.008  .  .  . 
0.007  .  .  . 
0.006  .  .  . 
0.005  .  .  . 
Positive  after  cooling.  Positive  after  standing. 
and  standing  for  45 
minutes. 
0.004  •  •  • 
Positive   after  cooling 
and  standing  for  1 
hour. 
0.003  .  .  . 
Positive   after  cooling 
and  standing  1  hour 
20  minutes. 
0.0025  .  . 
Positive   after  cooling 
Positive  after  standing. 
and  standing  for  1% 
hours. 
0.002  .  .  . 
Negative  (amorphous 
deposit)  after  stand- 
ing for  four  hours. 
0.00125  . 
Positive  after  standing 
O.OOO625 
Negative  after  standing 
for  14  hour. 
Conclusions. — Nylander's  Test  is  not  of  much  value  for  the  test- 
ing of  solutions  containing  less  than  0.5  per  cent,  dextrose. 
Fehling's  solution  is  the  most  sensitive,  showing  positive  reac- 
tion with  a  solution  containing  only  0.00125  per  cent,  of  dextrose. 
The  phenyl-hydrazine  test  is  highly  sensitive,  showing  positive 
reaction  with  0.0025  per  cent,  dextrose  solution  after  allowing  the 
test  to  cool  and  stand  for  i3^_  hours. 
Phenyl-hydrazine  test  solution  possesses  fairly  stable  keeping 
qualities. 
The  above  experiments  and  conclusions  were  made  in  the  Spring 
of  1907,  at  the  suggestion  of  Prof.  G.  H.  Meeker,  then  professor  of 
chemistry  of  the  Medico-Chirurgical  College,  Philadelphia.  Pa.  In 
1908,  Meeker  and  Stamm1  independently  duplicated  these  exper- 
1  Bulletin  of  the  Medico-Chirurgical  College  of  Philadelphia,  Dept.  of 
Pharmacy,  Vol.  in,  No.  3,  Feb.-March,  1908,  page  15. 
