Joseph McKenna, Walls v. Midland Carbon Company…
“ To the contention that oil could not be taken at a profit by one who made no use of the gas, it was replied that such fact 'went, not to the power to make regulations, but to their wisdom.' And this can be said of the contention, in the case at bar, that one element is more valuable than another; that carbon black is more valuable than the gas from which it is extracted. ”
