It shall be unlawful in the consular districts of the United States in China for any person whose permanent allegiance is due to the United States not licensed as a pharmacist within the meaning of this chapter to conduct or manage any pharmacy, drug or chemical store, apothecary shop, or other place of business for the retailing, compounding, or dispensing of any drugs, chemicals, or poisons, or for the compounding of physicians’ prescriptions, or to keep exposed for sale at retail, any drugs, chemicals, or poisons, except as hereinafter provided, or, except as hereinafter provided, for any person whose permanent allegiance is due to the United States not licensed as a pharmacist within the meaning of this chapter to compound, dispense, or sell, at retail, any drug, chemical, poison, or pharmaceutical preparation upon the prescription of a physician, or otherwise, or to compound physicians’ prescriptions, except as an aid to and under the proper supervision of a pharmacist licensed under this chapter. And it shall be unlawful for any person, firm, or corporation owing permanent allegiance to the United States owning partly or wholly or managing a pharmacy, drug store, or other place of business to cause or permit any person other than a licensed pharmacist to compound, dispense, or sell at retail any drug, medicine, or poison, except as an aid to and under the proper supervision of a licensed pharmacist. Where it is necessary for a person, firm, or corporation whose permanent allegiance is due to the United States and owning partly or wholly or managing a pharmacy, drug store, or other place of business to employ Chinese subjects to compound, dispense, or sell at retail any drug, medicine, or poison, such person, firm, or corporation, owner, part owner, or manager of a pharmacy, drug store, or other place of business may employ such Chinese subjects when their character, ability, and age of twenty-one years or over have been certified to by at least two recognized and reputable practitioners of medicine, or two pharmacists licensed under this chapter whose permanent allegiance is due to the United States.