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So far as regards substances other than those which appear in the Table contained in Article 1, and which may hereafter be included in the Pharmacopœias, the Contracting Governments undertake that the following rules shall apply:

(a) No potent drug shall be directed to be prepared in the form of a medicinal wine (vinum);

(b) Tinctures of potent drugs shall be directed to be prepared of the strength of 10 per cent. and by percolation;

(c) Fluid extracts of potent drugs shall be prepared of the strength of 100 per cent.

The Contracting Governments shall adopt a normal drop-measure, the external diameter of whose outlet tube shall be exactly 3 millimetres, that is