872  Scientific  and  Technical  Abstracts.      j  ^^i^™ 
infectant  and  its  peculiar  behavior  against  certain  pathogenic  organ- 
isms. 
The  results  reported  will  be  of  interest  to  bacteriologists  and 
chemists  who  are  concerned  with  testing  pine-oil  and  pine-distillate 
product  emulsions  and  to  hospital  authorities,  dentists,  sanitarians 
and  others  who  use  these  products  as  disinfectants.  The  investiga- 
tors found  that  these  products,  while  effective  against  B.  typhosus, 
are  not  effective  against  M .  aureus  and  B.  anthracis,  and  should  not, 
therefore,  be  used  for  general  disinfecting  purposes.  When  using 
pine-oil  emulsions  against  B.  typhosus  it  is  safer  for  practical  pur- 
poses, according  to  the  reports,  to  employ  a  solution  five  times  the 
strength  capable  of  killing  the  organism  in  five  minutes.  Thus,  a 
product  showing  by  the  Hygienic  Laboratory  method  a  killing  power 
°f  %oo  should  be  used  in  a  %0o>  or  1  per  cent,  dilution.  If  the 
product  will  not  give  a  dilution  of  such  a  concentration  and  remain 
completely  emulsified,  it  should  not  be  used  as  a  disinfectant. 
Copies  of  Bulletin  No.  989,  giving  data  upon  which  conclu- 
sions are  based,  may  be  had  upon  application  to  the  Division  of  Pub- 
lications, Department  of  Agriculture,  Washington,  D.  C. 
SCIENTIFIC  AND  TECHNICAL 
ABSTRACTS 
Determination  of  Sugar  in  Normal  Urine.  —  Benedict 
and  Osterberg  (Jour.  Biol.  Chem.,  1921,  48,  51),  describe  the 
following  method  which  in  their  hands,  after  extensive  trial  has 
given  good  results.  The  sample  should  be  diluted  so  that  the 
sp.  gr.  is  not  above  1030.  Fifteen  cc.  are  mixed  with  1  gram  of 
purified  bone  charcoal  (see  below),  shaken  occasionally  during  ten 
minutes,  and  filtered  through  a. dry  filter.  Not  more  than  3  cc.  of 
the  filtrate  should  be  used  for  the  determination,  and  the  amount 
used  should  contain  about  0.001  gram  sugar.  The  volume  should  be 
measured  into  a  large  test  tube  which  is  marked  at  25  cc,  and  if  less 
than  3  cc.  of  the  sample  is  used  water  should  be  added  to  make  up 
to  this  volume.  One  cc.  of  a  0.6  per  cent,  of  picric  acid  solution 
prepared  from  the  dry  acid,  0.5  cc.  of  a  5  per  cent,  sodium  hydroxide 
solution  are  added  and  then  5  drops  of  a  50  per  cent,  acetone  solu- 
