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TABLE OF EQUIVALENTS. . 29
The average " drop " (water) mav be considered equal to
0.05 CC, or 0.05 Gm. An average teaspoon holds 5 C. C,
and an average tablespoon 20 C.C. Decimal numbers should
be used as far as practicable without sacrifice of accuracy as to
strength and dose of the preparation. It is safe to prescribe
30 Gm. for one troy ounce, and 250 C.C. for eight fluid ounces.
The above contains all that is necessary to know or
LEARN of the metric system, in order to write metric pre-
scriptions, without a metric posological table, or with one.
To become familiar with the system, the rules given above for
the conversion of apothecaries' weights and measures into the
corresponding metric quantities, may be profitably used, the re-
sults to be verified by comparison with the following —
TABLE OF EQUIVALENTS.
apothecaries' METRIC apothecaries' metric
WEIGHTS weights weights weights
(and measures). (and measures^. (and measures). (and measures).
Troy grains Grams or cubic Drachms G ra ms
{or tninints). centhneters). (or ^uiiirac/ims) {or cubic centimeters).
0.00 I
^h (nnre) 4
A 0.002 ij-^Ts) 2 8
tV 0.004 (toVit) 4 16
o.ooS 6 24
i (t^Vo)
^i 0.016 (A) Troy ounces [or flu 'dounces).
I 0.033 (tV) I 32
I 0.066 2 64
(tV)
2 0.133 (A) 4 128
5 0.333 G) 6 192
10 0.666 8 256
(1)
IS 1.000 (0 12 384
20 J -333 16 512
(H)
30 2.000 (2)
The adoption of the metric system of weights and measures is
physician to continue to make use of fluid measures in writing prescriptions, es-
pecially as he is aheady accustomed to this, and would not then have to bear in
mind the specific gravity of avy hquid ingredient in the prescription. To the
pharmacist it makes hut little difference, as he will have both weights and meas-
ures, and can use one or the other, as may be directed. If the physician discards
measures, he must, of necessity, so adjust the proportion in his formula as to pro-
duce a mixture of which, after all, the dose must be a " teaspoonful," or some
other convenient measure, and this is as unnecessary as it is difficult.— Oscar
Oldberg, Phar. D., in Blackiston's Phys. Visiting List.
TABLE OF EQUIVALENTS. . 29
The average " drop " (water) mav be considered equal to
0.05 CC, or 0.05 Gm. An average teaspoon holds 5 C. C,
and an average tablespoon 20 C.C. Decimal numbers should
be used as far as practicable without sacrifice of accuracy as to
strength and dose of the preparation. It is safe to prescribe
30 Gm. for one troy ounce, and 250 C.C. for eight fluid ounces.
The above contains all that is necessary to know or
LEARN of the metric system, in order to write metric pre-
scriptions, without a metric posological table, or with one.
To become familiar with the system, the rules given above for
the conversion of apothecaries' weights and measures into the
corresponding metric quantities, may be profitably used, the re-
sults to be verified by comparison with the following —
TABLE OF EQUIVALENTS.
apothecaries' METRIC apothecaries' metric
WEIGHTS weights weights weights
(and measures). (and measures^. (and measures). (and measures).
Troy grains Grams or cubic Drachms G ra ms
{or tninints). centhneters). (or ^uiiirac/ims) {or cubic centimeters).
0.00 I
^h (nnre) 4
A 0.002 ij-^Ts) 2 8
tV 0.004 (toVit) 4 16
o.ooS 6 24
i (t^Vo)
^i 0.016 (A) Troy ounces [or flu 'dounces).
I 0.033 (tV) I 32
I 0.066 2 64
(tV)
2 0.133 (A) 4 128
5 0.333 G) 6 192
10 0.666 8 256
(1)
IS 1.000 (0 12 384
20 J -333 16 512
(H)
30 2.000 (2)
The adoption of the metric system of weights and measures is
physician to continue to make use of fluid measures in writing prescriptions, es-
pecially as he is aheady accustomed to this, and would not then have to bear in
mind the specific gravity of avy hquid ingredient in the prescription. To the
pharmacist it makes hut little difference, as he will have both weights and meas-
ures, and can use one or the other, as may be directed. If the physician discards
measures, he must, of necessity, so adjust the proportion in his formula as to pro-
duce a mixture of which, after all, the dose must be a " teaspoonful," or some
other convenient measure, and this is as unnecessary as it is difficult.— Oscar
Oldberg, Phar. D., in Blackiston's Phys. Visiting List.
