All cities, large towns, and even most small towns have drugstores. The drugs these stores sell are chemicals that help people get well or keep well. Medicines are made of drugs. A medicine may have only one drug in it or it may be a combination of several different drugs.
   Some drugs come from plants. Penicillin, for instance, comes from a little mold plant called penicillium. Some drugs come from animals. Cortisone comes from certain ani­mal glands. Other drugs come from the earth. Sulfur is one of them. Scientists are producing still other drugs from chemicals in their laboratories. Year after year new drugs are discovered.
   Certain drugs are called narcotics. A person may take one of these drugs for so long that finally his body cannot get along without it. In the end, such a drug may do him a great deal of harm.