It is a perennial plant, and found wild in great abundance near Guildford, where great quantities might be gathered for use, and where a great deal of the seed could be collected.  Its culture is very similar to that of the Teazle, with this difference, it requires the hoe at work constantly all the summer months.

The two plants Weld and Woad from the similarity of names are frequently confounded with each other, and some of the best agricultural writers have fallen into this error.  They are two very different plants, and ought to be well defined, being each of them of very material consequence in this country.

98.  Linum usitatissimum.  Flax, or lint-seed.—­Is grown for the purpose of making cloth, and has been considered a very profitable crop.  The culture and management is similar to that of Hemp, and the seeds are in great demand for pressing.  Lintseed oil, which it produces, is much used by painters, and is the only vegetable oil that is found fit for such purposes in general.  The seeds are of several uses to the farmer; a tea is made of it, and mixed with skimmed milk, for fattening house-lambs and calves.  Oxen are often fattened on the seed itself; but the cakes after the oil is expressed are a very common and most excellent article for fattening both black cattle and sheep.  These are sold at from 10 l. to 16 l. per thousand.

It will require three bushels of Flax-seed for one acre, as it must be sown thick on the land.  Lintseed cake has been used also for manure; and I have seen fine crops of Turnips where it has been powdered and sown in the drills with the seed.

99.  Reseda luteola.  DYER’S-weed, or Weld.—­Is often confounded with Woad, but is altogether a very different plant.  Weld is cultivated on the chalky hills of Surry, being sown under a crop of Barley, and the second year cleaned by hoeing, and then left to grow till it blooms, when it is pulled and tied up in small bundles, and after drying is sent to market, where it is purchased for dyeing yellow, and is in great request.

100.  Rubia tinctoria.  Madder.—­This very useful dyeing drug used to be grown in this country in considerable quantities, but it is not cultivated here at the present time.  The principal part of what is used now is brought from Holland, and affords a considerable article of trade to the Dutch farmers.  Those who wish to be informed of the mode of culture may consult Professor Martyn’s edition of Miller’s Dictionary.

Some years since Sir Henry Englefield, Bart., obtained a premium from the Society of Arts for the discovery of a fine tint drawn from Madder, called the Adrianople red.  It was found that it was to be obtained from a variety of the Rubia brought from Smyrna; and Mr. Smyth, our consul at that city, was prevailed on by Dr. Charles Taylor to procure seeds from thence, which the Society did me the honour of committing to my care; and I have now a considerable stock of that kind, from whence I have myself obtained the same beautiful and superior tint.  See Trans.  Soc.  Arts. vol. 27, p. 40.