JELLIES
Are not the nourishing food they were at one time considered to be, and many eminent physicians are of opinion that they are less digestible than the flesh, or muscular part of animals; still, when acidulated with lemon-juice and flavoured with wine, they are very suitable for some convalescents. Vegetable jelly is a distinct principle, existing in fruits, which possesses the property of gelatinizing when boiled and cooled; but it is a principle entirely different from the gelatine of animal bodies, although the name of jelly, common to both, sometimes leads to an erroneous idea on that subject. Animal jelly, or gelatine, is glue, whereas vegetable jelly is rather analogous to gum. Liebig places gelatine very low indeed in the scale of usefulness. He says, “Gelatine, which by itself is tasteless, and when eaten, excites nausea, possesses no nutritive value; that, even when accompanied by the savoury constituents of flesh, it is not capable of supporting the vital process, and when added to the usual diet as a substitute for plastic matter, does not increase, but on the contrary, diminishes the nutritive value of the food, which it renders insufficient in quantity and inferior in quality.” It is this substance which is most frequently employed in the manufacture of the jellies supplied by the confectioner; but those prepared at home from calves’ feet do possess some nutrition, and are the only sort that should be given to invalids. Isinglass is the purest variety of gelatine, and is prepared from the sounds or swimming-bladders of certain fish, chiefly the sturgeon. From its whiteness it is mostly used for making blancmange and similar dishes.