This section is from the book "An Experimental History Of The Materia Medica", by William Lewis.
Ovum gallinaceum Pharm. Lond. Hens egg,
Eggs are accounted very nutritious, but difficult of digestion, especially if boiled hard. In medicine, the yolk has been employed as an intermedium for rendering resinous juices and bal-sams soluble in water: it answers this purpose less effectually, and less elegantly than vegetable gums, the solutions obtained by means of the animal matter being apt on standing to become putrid or rancid. The yolk, exsiccated by a gentle warmth, forms a friable concrete; the white, a firm semitransparent one, in appear-ance resembling amber or gum-arabic, and foluble again in watery liquors. The boiled white, placed in a moist cellar, deliquiates spon-taneously, and gummy-resinous substances, included in it, dissolve along with it: preparations of this kind have been directed for medicinal uses, but it does not appear that more of the gummy-resin is thus dissolved by the liquamen of the egg than by simple water.
The shells of eggs, freed, after boiling, from the inner skin, and levigated into fine powder, are sometimes used as absorbents, and supposed, when combined with the acid humours in the first passages, to be less disposed to bind the belly than most of the other testaceous powders,