AmAprUn;£92arm'}     Unnds  Medicated  Skin  Varnishes.  199 
vary  with  the  intensity  of  color.  In  white  wax  it  was  from  2  to  7; 
and  in  yellow  wax  from  818  to  1 106. 
As  possible  adulterants  are  mentioned  paraffin,  Chinese  wax, 
Japan  wax,  ozokerite,  ceresin,  vegetable  waxes,  carnauba  wax, 
stearic  acid,  suet,  resin,  mineral  and  organic  matter.  Several  speci- 
mens of  adulterated  wax  were  examined  by  the  author ;  and  for 
comparison  with  the  results  obtained  with  pure  wax,  Hubl's  table 
of  results  with  wax  substitutes  is  quoted  (see  Amer.  Jour.  Phar., 
1884,  p.  480);  also  the  results  obtained  at  the  central  chemical 
laboratory  of  Rome  in  1890,  which  are,  in  part,  given  in  the 
annexed  table : 
Acid  Numbers. 
Fusing 
Acids 
Total 
Iodine 
point. 
soluble 
Free 
acids. 
number. 
in 
acids. 
(Saponi- 
water. 
fication.) 
47-54 

2 
18-28 
216-222 
6-7-55 
Vegetable  wax,  ....... 
53*5 
2 
22 
218 
6-85 
47-54 
2 
17-19 
218-220 
6-6-8-2 
83-84 
0 
4-6 
79-82 
7-9 
60-80 
0 
0 
0 
0*06 
38-74 
0 
0 
0 
1-7-3-1 
62-66 
0 
95-H5 
102-119 
I3-I8-5 
Suet,  
42-50-5 
0 
2  75-5 
196-213 
27-40 
55 '5 
0 
204 
209 
4 
0 
168 
178 
i35'6 
Yellow  beeswax,  
62-64 
O-I 
19-21 
91-97 
8-1 1 
63-64 
0-2 
20-23 
93-i 1 1 
2-7 
UNNA'S  MEDICATED  SKIN  VARNISHES. 
Skin  varnish  is  the  term  applied  by  Unna  to  preparations  used  in 
dermatological  practice  for  forming  a  thin  covering  on  the  skin. 
The  principal  bases  for  these  preparations  are  the  following : 
Bassorin  Varnish. — The  pure  bassorin  basis  is  obtained,  according 
to  Elliot,  by  filtering  tragacanth  mucilage  (15  :  100)  in  a  filter  heated 
by  steam,  evaporating  and  mixing  with  glycerin.  A  similar  basis 
may  be  prepared  by  stirring  five  parts  powdered  salep  with  95  parts 
cold  water  until  a  smooth  mucilage  is  obtained,  then  heating  for 
