The process of curing varies considerably in different states. Some growers prefer to put the tobacco into the sheds immediately after cutting, and allow very little exposure in the fields. The temperature is usually kept steady at about 90° F. Again the process is different according to the quality of tobacco required. For the heavy type of leaf which is intended for the export trade, the curing in the sheds is done by an _open_ fire, the fuel being usually hardwood logs. The smoky, creosotic flavor is absorbed by the leaf, and, although this flavor is not relished by the smokers of the U. S., it is much liked in Europe. The curing in such cases may last for 4 or even 5 days. The tobacco is suspended on poles by the stalks and the fires are built on the floor immediately under them so that the carbonaceous products are easily absorbed by the open pores of the leaf. The chewing and pipe smoking tobacco, as well as cigarette tobaccos including all the bright yellow tobaccos used in the U. S. are usually cured by _Flue_ curing. In this case the heat comes from pipes which run around the curing houses and are fed from a furnace in an adjoining chamber or in a cellar. The temperature can be easily regulated. "Flue" curing is generally completed in about 4 days. "Flue" curing does not clog up the pores of the leaf which therefore remain more absorbent than in the open fire cured tobacco. This is an important matter for the manufacturers because the flue cured leaf will absorb twice as much of the flavoring sauces (which are added to certain kinds of tobacco) than tobacco leaf cured by open fires. Air exposure of 6 to 8 weeks (sometimes extended to 3 or 4 months) is necessary when tobacco is cured by exposure to the sun and air. It is claimed, however, that this method of curing preserves far better the natural flavor of the leaf; and, where flavor and aroma are highly important, this method is always preferred. Hence all cigar leaf tobaccos are cured by exposure to natural sunlight and not by artificial heat. "Air" curing as distinct from sun curing is generally done in open sheds which are thoroughly ventilated and kept as far as possible at a temperature of about 75° F. The leaf is usually allowed to cure while attached to the stalk, but Florida curers generally prefer to strip the leaf and treat it separately. The finer classes of pipe smoking tobaccos are air cured. After the curing is completed the color of the leaf is usually fixed. Generally speaking, the riper the leaf the lighter will be its color when cured. Thus the bottom leaves of the plant will be lighter in color than the upper leaves because they are more mature. (_For references see end of Chapter VIII_) CHAPTER VII THE MARKETING AND SALE OF TOBACCO LEAF METHODS OF DISPOSAL BY THE GROWER. THE WAREHOUSE SYSTEM. DIRECT PURCHASE. PRINCIPAL MARKETS IN THE UNITED STATES. PRICES. THE MARKETING AND SALE OF TOBACCO LEAF