In particular, and without prejudice to the generality of the foregoing power, such bye laws may provide for (a). . . . . . (b). . . . . . (c). . . . . . (d)fixing, altering or postponing days for settlement; (e)determining and declaring market rates, including opening, closing, highest and lowest rates for goods; (f). . . . . (g). . . . . . . (h). . . . . . . (i). . . . . . . . (j). . . . . . . (k). . . . . . . . (1). . . . . . . . (m). . . . . . . . (n) the regulation of fluctuations in rates and prices; (o) the emergencies in trade which may arise and the exercise of powers in such eme regencies including the power to fix maximum prices; 743 As the power of the Central Government to make bye laws under section 12 is admittedly co extensive with the power of the Associations to frame byelaws, it is not necessary to refer to the terms of the latter sections Before considering in detail the argument on this part of the case we consider it useful to set out a few of the bye laws of the Association whose validity has not been challenged and which would show the manner in which the Association has been functioning in emergencies such as that for which the impugned bye law provides, Bye law 52 which still exists: "52.(1) If in the opinion of the Board an emergency has arised or exists, the Board may, by a resolution, (i) passed by a majority of not less than and (ii) confirmed prohibit, as from the date of such confirmation or from such later date as maybe fixed by the Board in the resolution referred to in sub clause (1), (a)trading in the Hedge Contract for any delivery or deliveries or (b) all trading in such contracts as are referred to in clause (a) for a specified period "52A.