Note 1227 — I.—PHÆNOGAMOUS OR FLOWERING PLANTS. (continued 10)

This property of Umbelliferone may be beautifully shown by dipping some bibulous paper into water which has stood for an hour or two on lumps of galbanum, and drying it. A strip of this paper placed in a test tube of water with a drop of ammonia, will give a superb blue solution, instantly losing its colour on the addition of a drop of hydrochloric acid.