In such a mode of explanation, however, is exemplified a feature which must not be forgotten in discussing Darwinism,--namely the fatal facility with which seeming arguments can be procured on its behalf. As Mr. Mivart well remarks:[203] "The Darwinian theory has the great advantage of only needing for its support the suggestion of some possible utility, actual or ancestral, in each case--no difficult task for an ingenious, patient, and accomplished thinker." And our _North British_ Reviewer makes a similar comment: "The believer who is at liberty to invent any imaginary circumstances, will very generally be able to conceive some series of transmutations answering his wants." Or if, as in the above instance of the Argus' eyes, a series is actually found, it is even less difficult to take for granted that it can have but one significance; while such assumptions are too frequently accepted without hesitation or demur, although it would be no easy task to show that they rest upon any solid grounds. When, in addition, either Mr. Darwin himself or some of his leading partisans has declared that some unverified process has undoubtedly occurred, or that they see no reason to doubt its occurrence, or that nothing which we know precludes its possibility,--it appears to be widely supposed that something substantial is thereby added to the scientific evidence, and that the suppositions thus sanctioned may even rank as facts. But however such a method may avail to secure acceptance for a doctrine, it does nothing for its scientific value. Such a style, as Mr. Mivart says,[204] is calculated to impress only minds too easily dominated, and not prepared by special studies accurately to weigh the evidence put before them.