We first notice here a clear recognition of the kinds of truth distinguished by Adler, with the “fact” of evolution belonging to the first order and theories of evolution belonging to the second. The second, which is referred to by the term “hypothesis,” consists of facts in an elaboration. We note furthermore that this scientist has called them fundamentally different things—so different that one is entitled to have not merely doubts but “tremendous doubts” about the second. Now let us imagine the dialecticians of the opposite side approaching him with the following. You have said, Professor Metcalf, that the fact of evolution and the various theories of evolution are two quite different things. You have also said that the theories of evolution are so debatable or questionable that you can conceive of much difference of opinion about them. Now if there is an order of knowledge above this order of theories, which order you admit to be somewhat speculative, a further order of knowledge which is philosophical or evaluative, is it not likely that there would be in this realm still more alternative positions, still more room for doubt or difference of opinion? And if all this is so, would you expect people to assent to a proposition of this order in the same way you expect them to assent to, say, the proposition that a monkey has vertebrae? And if you do make these admissions, can you any longer maintain that people of opposite views on the teaching of evolution are simply defiers of the truth? This is how the argument might have progressed had some Greek Darwin thrown Athens into an uproar; but this argument was, after all, in an American court of law.