In measuring liquids by drops, a glass medicine-dropper should be used, as the uncertainty of dropping from various shaped bottles should not be depended upon.

The following list shows the relative differences between drops and minims of a few of the drugs used in dental practice.

Number of Drops in Sixty Minims -

Carbolic Acid....... 111

Sulphuric Acid.......128

Sulphuric Acid (dilute) .... 60

Aromatic Sulphuric Acid . . . 146

Ether.......... 172

Alcohol......... 146

Alcohol (dilute)...... 137

Aqua Destillatse...... 60

Aqua Ammonia ...... 64

Chloroform (purified) .... 250

Creosote......... 122

Fl. Extract of Ergot..... 133

Glycerine ........ 67

Liq. Chloride of Zinc .... 89

Oil Cajeput........ 134

Oil Cloves........ 130

Oil Cinnamon....... 126

Oil Wintergreen...... 125

Oil Peppermint....... 129

Oil Sassafras....... 133

Oil Turpentine....... 136

Aromatic Spts. of Ammonia . . 142

Spts. Camphor....... 143

Syrups......... 65

Tinct. Aconite....... 146

Tinct. Benzoin (Comp.).... 148

Tinct. Digitalis...... 128

Tinct. Chloride of Iron .... 150

Tinct. Opii........ 130

Vinum Opii........ 100