Section 12. F'rohibition or regula%ion _

12. F'rohibition or regula%ion `of` the diqdsl `of` drug.-If tn tlie opinion of the Cbief Commissioner iti is necessary or expedient' so to do, he may, by order , in writing- - (a) prohibit the disposal of any drug excecll in such oircumsfiances and - under such conditions as may be specified in %he order; - '(b) direct the sale of any drug to any such dealer or class of dealers - and in. such quantities as may be specified in the order; and make such further orders `as` appear to him to be nemssary or expedienf in connectTon with' any order issued under this sectton.