Am.  Jour.  Pharm. 
August,  1901. 
Polarization  by  Mixtures. 
371 
The  two  parts  of  the  tube  are  referred  to  as  No.  1  and  No.  2. 
Their  lengths  were  made  as  nearly  equal  as  possible,  but  a  cane 
sugar  test  showed  that  No.  1  rotated  the  plane  iy°-8s  and  No.  2 
10  — 
0  
— 
0  
y 
p 
0  — 
A 
^  1 
0  
0  — 
— 
3  
0  
& 
7   


y^ 

Fig.  3.— Length  of  tube.    Optical  rotation. 
l7°'79-    Their  ratios  were,  therefore,  1  :  1-002.    The  following 
table  gives  some  of  the  results  of  this  work: 
TABLE  III. 
Liquid. 
Rotation 
Observed. 
Rotation 
Calculated. 
Per  Cent,  of 
Deviation. 
Granulated  sugar  sol.  tube  No.  i. 
io°-54 
Grape  sugar  sol.  tube  No.  i. 
7°  99 
Cane  sugar  sol.  tube  No.  2. 
I7°79 
Cane  sugar  sol.  tube  No.  1. 
I7°*83 
Grape  sugar  No.  1. 1 
Cane  sugar  No.  2.  j 
250-83 
25°78 
02 
Granulated  sugar  No.  1.  \ 
Cane  sugar  No.  2.  j 
28°-44 
28°  40 
0*1 
In  making  the  test  for  oils  it  was  found  that  enough  of  the  pitch 
was  dissolved  to  render  the  liquid  somewhat  opaque.  Ordinary 
