A text-book of pharmacology and some allied sciences : (therapeutics, materia medica, pharmacy, prescription-writing, toxicology, etc.) / by Torald Sollmann.

Torald Hermann Sollmann

Date:: 1901

Credit: A text-book of pharmacology and some allied sciences : (therapeutics, materia medica, pharmacy, prescription-writing, toxicology, etc.) / by Torald Sollmann. Source: Wellcome Collection.

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$Fractions are written as common fractions: gr. 45, not Sion: Popular Measures.—These are formed of utensils com- monly found in the household, and are, of course, very inexact. They should be displaced by graduated medicine glasses, which can now be obtained very cheaply. The usually accepted equivalents of these measures are : 1 drop (gtt. ) = ..1 Minim] .|S= ore 1 teaspoon aR HE ot Ae oe 1 dessertspoon aoe eS +1 =0 “ghee 1 tablespoon =. 415° 6423) = ae I wine-glass SSeS == 100; 0 1e.e8 I tea-cup part Ne be Ve en rf 4 WAYS 1 tumbler re seth oa = ZAG Oe 1 knifepointful (tableknife) == 15 to 30 grs. = 1.0 to 2.0 Gm. 3. The units of temperature may also be treated in this place. The scientific scale is the Centigrade or Celsius. In this the range between the freezing-point of water (0° C.) and its boiling-point (100° C.) is divided into 100 parts. In the Fahrenheit scale, in common use, the freezing-point of water-is 32° F., the boiling-point 212° F., and the range, therefore, 180° F. Each degree Centigrade therefore = 4 Each degree Fahrenheit te The conversion of one scale into the other may be done by the following rules : To convert degrees Centigrade into Fahrenheit : multiply by 2 and add 32. To convert degrees Fahrenheit into Centigrade : subtract 32 and multiply by 32. 4. The advantages of the metric system will now be > manifest. 3 . 1. The unit is a final and natural one, which can always be verified. 2. There is a simple relation between linear, solid, and liquid measures. 1 As a matter of fact, the size of a drop varies greatly according to the nature of the fluid and of the container; there may be from 50 to 150 to a flui- drachm. 2 Really from 14 to 2 f1Z.$