53o 
Specific  Gravity  of  Fluid  Extracts. 
Am.  Jour.  Pharm. 
Dec,  1876. 
the  menstrua  of  alcohol,  glycerin  and  water  is  not  represented  in  the 
list. 
The  strength  of  a  fluid  extract  is  indicated  by  the  difference  between 
its  own  specific  gravity  and  that  of  the  menstruum.  What  is  required, 
therefore,  is  to  know  the  specific  gravity  of  the  approximate  menstrua, 
not  as  they  are  used  for  percolation,  but  as  they  are  likely  to  exist  in 
the  extract  when  done. 
I  have  ascertained  the  specific  gravity  of  the  fluid  extracts  which  I 
have  on  hand.  Below  I  give  the  list  with  the  specific  gravity  of  each 
annexed.  28  are  officinal  and  18  non-officinal,  39  are  of  own  make 
and  7  purchased.  Before  each  series  of  fluid  extracts  the  approximate 
menstruum  and  its  specific  gravity  has  been  placed.  As  a  matter  of 
course  due  regard  has  been  paid,  during  process  of  weighing,  to  the 
temperature  of  the  extracts  and  the  state  of  the  atmosphere,  the  ther- 
mometer showing  6o°  Fahrenheit  and  barometer  30  in. 
Alcohol,   -825 
Extract,  buchu  fluid.        .  .  '895 
"  cimicifugas  fluid.      .  '890 
"  damianae  fluid.  purchM,  '935 
"  cubebas  fluid.       .  .  -871 
"  gelsemini  fluid.        .  '904 
"  serpentarias  fluid.  .  -910 
"  Valeriana?  fluid.        .  -975 
Alcohol  dilutum,       .       .       .  -942 
Extract,  lactucas  fluid,  purch'd,  "992 
"       pareiras  brav.  fluid.  "  '975 
"       sennas  comp.  fluid.  "  1*025 
"       apocyn.  cannab.  fluid.  '982 
"       hyoscyami  fluid.      "  1*025 
"      grindel.  robust,  fluid."  1*028 
Alcohol,      pts.  6 
Glycerina,    "    1  )■                .  -957 
Aqua,  "  1 
Extract,  colombas  fluid.   .  .  1*012 
"      hydrast.  can.  fluid.  .  '971 
"      rhei  fluid*       .       .  1*086 
Alcohol,  pts.  7 
Glycerina,    "  4 
Aqua,  "  5 
Extract,  belladonnas  fol. 
"  caffeas 
"  collinsonias 
"  cort.  aurant. 
"  cinchonas  rubr. 
"  alni  rubr. 
"  digitalis 
"  ergotas 
"  eucalypt.  glob. 
"  gossypii 
"  gentianas 
"  kalmias  latit". 
u  kousso 
"  lappas 
"  liquiritias 
"  pruni  virg. 
"  pteleas 
"  stillingias 
"  sambuci 
"  sumbul 
"  senegas 
"  taraxaci 
"  uvas  ursi 
"  scillas  comp. 
fluid. 
1*004 
1*098 
1*124. 
1*045 
I*IOI 
1*092 
1*044 
1*075 
1*071 
1*073. 
1*023 
1*085 
1*095 
1*091 
1*132 
1*101 
1*095 
1*043 
1*055 
I'IOZ 
1*031 
1*091 
1*121 
1*131 
1*163 
