124  Dose  Measures  and  Measured  Doses.     {AVa??h,  i9o!.rm- 
It  is  popularly  supposed  that  the  ideal  dose  measure  is  to  be 
found  only  in  the  graduated  medicine  glass ;  so  much  so,  that 
authoritative  works  on  pharmacy  and  therapeutics  unhesitatingly 
recommend  the  use  of  these  measures  where  any  degree  of  accuracy 
is  to  be  desired.  It  has  even  been  asserted  that  these  measures  are 
invariably  accurate  and  could  be  relied  on  to  deliver  the  exact 
quantities  intended  by  the  prescriber. 
Let  us  take  up  first  the  matter  of  accuracy.  The  price  at  which 
these  measures  are  usually  sold  would  evidently  preclude  any  argu- 
ment that  a  reasonable  amount  of  care  had  been  expended  in  their 
manufacture,  or,  that  they  had  been  individually  tested  as  to  their 
actual  capacity  at  various  points. 
Admitting  this,  it  need  not  surprise  us  if  we  find  that,  at  times, 
these  measures  are  not  even  approximately  correct. 
One  peculiar  feature  of  the  problem  is  the  fact  that  the  more 
expensive  medicine  glasses  are  much  more  likely  to  be  wrong  than 
Table  No.  2. — CAPACITY  OF  MEDICINE  GLASSES  IN  CUBIC  CENTIMETRES. 
Glass  No. 
Teaspoon. 
Dessertspoon. 
Tablespoon. 
2  Tablespoons. 
Normal  
37 
7'4 
14  8 
29'6 
3-o 
5'2 
122 
27'5 
6-4 
8  8 
16-4 
33  "5 
4-8 
8-4 
14-8 
31-0 
3  5 
7'° 
14-2 
29'5 
3-6 
7-o 
i4-6 
30-0 
6  
3:2 
7-2 
14-8 
32' 
50 
9-0 
16-0 
3r6 
8  •  
41 
7-i 
15-2 
34"o 
4-9 
8-2 
14  8 
310 
35 
7*2 
i4"4  . 
31-0 
4-2 
9-2 
17-2 
33*° 
3-6 
6-8 
13-2 
30-5 
4- 2 
y8 
15*2 
34"5 
*4  
3-8 
7-6 
15*2 
31-0 
15  
4-3 
8'2 
16-0 
Metric  normal  .  .  . 
S'o 
I0"O 
I5'° 
30" 
16  
4"i 
8-2 
i6-o 
336 
17  
4"9 
10-3 
15-2 
3°' 
18  
4  5 
9-6 
I5'° 
