Am.  Jour.  Pharm.  ) 
Nov.  1875.  J 
The  Strength  of  Liquids. 
487 
percentage,  multiply  the  difference  between  the  percentage  of  the 
liquid  a  and  the  desired  percentage  of  the  mixture  by  the  quantity  of 
the  liquid  ^,  and  divide  the  product  by  the  difference  between  the  de- 
sired percentage  and  that  of  the  liquid  to  be  mixed  Vith  a  ; 
2.  x=-^^^^ — if  water  must  be  added  ;  or,  in  words  : 
To  find  A-,  the  quantity  of  water,  proceed  as  described  sub.  i,  but 
divide  the  product  by  the  desired  percentage  only. 
II.  We  have  to  prepare  a  liquid  of  desired  weight  and  percentage? 
and  have  on  hand  a  liquid  of  the  same  kind  of  higher  and  another  of 
lower  percentage  (=a  stronger  and  a  weaker  liquid),  or  instead  of  the 
last  ohe,  water. 
If  we  call 
a — the  quantity  of  the  mixture  ; 
d — its  percentage  ; 
b — the  percentage  of  the  stronger  liquid  ; 
c — the  percentage  of  the  weaker  liquid  ; 
X — the  quantity  of  the  weaker  liquid,  or  of  water,  we  have  : 
1.  x=      — if  a  strono;er  liquid  must  be  mixed  with  a  weaker 
b — c  ^  ^ 
one  ;  or,  in  words  : 
To  the  quantity  of  the  weaker  liquid  to  be  added,  multiply  the 
difference  between  the  percentage  of  the  stronger  liquid  and  the  de- 
sired percentage  of  the  mixture  by  the  quantity  of  the  mixture,  and 
divide  the  product  by  the  difference  between  the  percentage  of  the 
stronger  and  that  of  the  weaker  liquid. 
2.  x=  ^  stronger  liquid  must  be  mixed  with  water  ;  or, 
in  words  : 
To  find  the  quantity  of  water,  proceed  as  described  sub.  i,  but 
divide  the  product  by  the  percentage  of  the  stronger  liquid  only. 
Cle'velandy  Ohio. 
THE  HONEY-BEE  AND  ITS  PRODUCTS. 
BY    B,  T.  CREIGHTON. 
Few  pharmacists  are  familiar  with  the  habits  of  the  honey-bee,  which 
supplies  the  honey  and  wax  so  much  used  in  pharmaceutical  preparations. 
There  are  several  varieties  of  bees.  Apis  mellifica,  but  as  their  habits 
are  essentially  the  same,  the  follwing  remarks  will  be  confined  to  the 
