The roots of the saffron crocuses are planted at the distance of about five inches from each other, and two inches deep in the ground. As soon as the flowers appear, they are gathered by hand every morning, just before they open; and, as they continue to open in succession for several weeks, the saffron harvest of course continues so long. When the flowers are gathered, they are spread on a table: the upper part of the pistil only is picked out, and the rest of the flower is thrown away. As soon as a sufficient quantity of the pistils have been collected, they are dried in a kind of portable kiln; over this a hair cloth is stretched, and upon it a few sheets of white paper. The saffron is scattered upon these to the thickness of two or three inches, and is then covered with several sheets of paper, over which is laid a coarse blanket five or six times doubled, or a canvas bag filled with straw. As soon as the fire has heated the kiln, a board, on which a weight is put, is placed upon the blanket to press the saffron into a cake. By the end of the first hour, a strong fire being employed, the cake is formed. This is then turned, and, for another hour, is subjected to an equal degree of heat. It is then turned a second time, and a more gentle heat is employed, till the cake becomes dry, during which time it is turned every half hour.
A field of saffron will continue in perfection for three or four years, yielding progressively, during this period, more numerous and larger flowers, as well as an increase of the bulbous roots; after which the offsets may be advantageously transplanted to other situations.
The saffron which is grown in England is considered superior to any that is imported from other countries. The best saffron may be known by the breadth of the blades. It ought not to be of too deep a red or orange colour, and should be fresh and tough, and have a strong but pleasant aromatic odour. Saffron should not be kept more than twelve months.
Saffron was much used by the ancients as a perfume, but, in this respect, their taste was very different from ours. Not only were the halls, theatres, and courts, through which they wished to diffuse an agreeable smell, strewed with this substance, but it was used by them for a scent, in vinous extracts. From saffron, with the addition of wax, the Greeks, as well as the Romans, prepared scented salves. In our own country it was formerly much used in medicine; having been esteemed an excellent remedy in hysterical and other complaints. When taken in small doses, it tends to exhilarate the spirits; but it ought to be used with great moderation. It is sometimes used by bakers, to colour and flavour different kinds of cakes and biscuits. With water or spirits it gives out a beautiful yellow colour; but this is not useful as a dye, as, on exposure to the air, it soon fades; and no means have hitherto been discovered by which it can be fixed and rendered permanent.
24. ORRIS ROOT is the root of a white flowered kind of iris, called Florentine Iris (Iris Florentina), which is a native of Italy, and is distinguished by having two flowers on each stalk, the petals bearded, and the leaves sword-shaped.
In a dried state this root is well known on account of its grateful odour, which somewhat approaches that of the violet. It is consequently much used in the manufacture of hair-powder, and other articles for which an agreeable scent is required. It is sometimes employed in medicine as a pectoral or expectorant, and sometimes in dropsies. In a recent state the root is extremely acrid; and, when chewed, it excites in the mouth a pungent taste, which continues for several hours; but this acrimony is almost wholly dissipated by drying.
Orris-root is chiefly imported from Leghorn.
25. The YELLOW WATER-FLAG, or COMMON IRIS (Iris pseudacorus) is a very conspicuous plant in most of our marshes. It has sword-shaped leaves, and, about the middle of July, bears large and beautiful yellow flowers.
The roots of this plant possess qualities which render them capable of being applied to many useful purposes. Their astringency is such that it is supposed they might be employed with great advantage in the tanning of leather. In the island of Jura, one of the Hebrides, they are used for dyeing a black colour; and the inhabitants of some parts of Scotland adopt them instead of galls in the making of ink. For this purpose they are cut into thin slices, and boiled, or infused in water, till the liquid is deeply tinged with blue. This is poured clear off, and the blade of a knife, or some other piece of iron, is put into it, and rubbed hard with a rough white pebble, by which process, after a little while, the liquor becomes perfectly black.
A slice of the fresh root, if held between the teeth, will, it is said, almost instantly remove the sensibility, and thus alleviate the pain, of tooth-ache. The leaves of this plant are considered poisonous to all cattle except sheep.