AmMa0rctr9o|rm-}    Dose  Measures  and  Measured  Doses.  125 
are  the  cheaper  variety  that  may  usually  be  purchased  for  a  mere 
trifle. 
We  have  measured  a  number  of  these  glasses  and  tabulated  the 
results  in  Table  No.  2.  In  explanation,  the  writer  would  like  to  say 
that  with  but  few  exceptions  all  of  these  glasses  are  samples 
obtained  from  manufacturers  or  dealers,  and  that  the  figures  are,  as 
in  the  case  of  the  spoons,  average  results  of  ten  or  more  measure- 
ments for  each  quantity,  made  as  nearly  as  possible  under  the  same 
physical  conditions. 
It  will  be  noted  that  there  is  a  marked  difference  in  the  quantities 
measured  from  the  various  measures,  and  that  some  of  these 
glasses  vary  at  different  points.  An  attempt  has  been  made  to 
demonstrate  the  reasons  for  this,  and  at  the  same  time  to  illustrate 
the  difficulty  most  persons  would  have  in  attempting  to  measure 
small  quantities  from  some  of  these  graduated  measures. 
Table  No.  3  gives  the  inner  diameter  of  the  various  glasses  at  the 
Table  No.  3. — GIVING  DIAMETER  OF  MEDICINE}  GLASSES  IN  M.M. 
DISTANCE  IN  M.M.  FROM 
Glass  No. 
Teaspoon. 
Dessertspoon. 
Tablespoon. 
Bot'mto  Table. 
Tea  to  Table. 
28- 
30- 
35" 
i3'5 
ii" 
33* 
34' 
36- 
i8-5 
ir 
35" 
35 '5 
37"5 
i5* 
IO" 
4  •  
34' 
37' 
40- 
I3'5 
io'5 
5  •  •  • 
40- 
40-5 
42- 
13" 
9' 
33' 
34' 
37' 
H' 
"'5 
39' 
40- 
42- 
14' 
8- 
8   
35' 
36'9 
39* 
16- 
IO* 
31- 
32' 
34" 
i8'5 
12' 
27' 
29' 
3i  5 
23'  • 
i6'5 
27-5 
3°* 
35" 
29' 
17' 
27- 
30- 
34' 
21" 
15" 
13.-  
30- 
32- 
35' 
22' 
I5- 
H  •  
29 '5 
32' 
34' 
21* 
16- 
15  ■  •  • 
26- 
27'5 
3i' 
26"  . 
18- 
16  
29- 
3i'5 
34'5 
22- 
16- 
30' 
32' 
34' 
21'5 
14' 
18  
26: 
28- 
30" 
