The proportionate dose for any age under adult life is represented by the number of the next birthday divided by 24; i. e. for one year 2-24 = 1/8. - Dr. Cowling.

The following is the scale of doses employed at Guy's Hospital, London, one being the unit or adult dose.

Age.

Dose.

1 month............................................................

1-20

3 months........................................................

1-15

6 months........................................................

1-10

9 months........................................................

1-9

1 year........................................................

1-7

2 years........................................................

1/6

3 years........................................................

1-5

4 years........................................................

1/4

5 and 6 years..........................................

1/3

7 and 8 years..........................................

1/4

10 to 12 years..........................................

2/3

13 to 15 years..........................................

3/4

18 to 20 years..........................................

5-6

21 to 45 years..........................................

1

50 years........................................................

5-6

60 to 70 years..........................................

3/4

80 to 90 years..........................................

2/3

100 years........................................................

1/2