Too much emphasis can not be placed upon the importance of carefully and thoroughly drying all crude drugs, whether roots, herbs, leaves, barks, flowers, or seeds. If insufficiently dried, they will heat and become moldy in shipping, and the collector will find his goods rejected by the drug dealer and have all his trouble for nothing. Another important matter to be considered in collecting drugs for market is freedom from foreign substances. All drugs should be clean and wholesome looking and contain no admixture of fragments of other plants, stones, dirt, or other impurities. A bright natural color is extremely desirable in leaves, herbs, and flowers, and adds much to the salability of the product. This can be readily brought about by giving careful attention to proper drying in the shade (not in direct sunlight), and by protection from dew or rain by placing the drugs under cover at nightfall or whenever necessary. Roots may be cleaned by washing, but leaves, herbs, and flowers should never be washed. It is important also to collect drugs in proper season only. Neglect in this respect will bring nothing but disappointment to the gatherer, as drugs collected out of season not only are not acceptable to the dealer on account of inferior medicinal qualities, but there will also be, in the case of roots, a greater amount of shrinkage in a root dug during the growing season than will take place when it is collected after growth has ceased. The collector should be sure that the plant he is collecting is the right one. There are many plants that closely resemble one another, yet one may possess medicinal properties and the other be absolutely useless. Again, a plant may contain very poisonous principles, and if represented to be something else, it might of course do untold injury. It would therefore be best, where any doubt exists, to send a specimen of the entire plant, including leaves, flowers, and fruits, to a drug dealer or to the nearest State experiment station for identification. ROOTS. Roots should never be collected during the growing season, as at that time they are deficient in medicinal properties, and they also shrink more in drying and weigh less than when gathered at full maturity. The roots of annual plants should be dug just before the flowering period, and those of biennial or perennial plants after the tops have dried, the former in the autumn of the first year and the latter in the fall of the second or third year.