But another question meets us here, more obscure and difficult than either the appearance or the characteristic effects of the darnel,--the question whether it is originally a specifically different plant, or only wheat degenerated. Some maintain that it is wheat which, by some mysterious causes in the processes of nature, has fallen, as it were, into a lower type. This view imparts additional fulness to the parable in its spiritual application. So interpreted, the picture exhibits not only the low estate of the sinful, but also the fact that they have fallen from a higher. In such cases, however, there is some danger lest the beauty and appropriateness of the conception should entice us to receive it on insufficient evidence. The fact that some plants in certain adverse circumstances tend to degenerate, and in certain favourable circumstances to attain a higher type, is well known in natural history; but it seems questionable whether these changes ever take place to such an extent, and in such a uniform method, as must be assumed if we take darnel for degenerated wheat. Agriculturists in Palestine believe and declare, that, when the season is wet, the wheat which they sow in certain fields in spring grows as zowan in harvest. It is difficult for one who is accustomed to observe the uniformity of nature in the reproduction of each species from its own seed, to believe that transformations so great are accomplished at a single step. An American writer, one of the latest authorities, and, in respect to his abundant opportunities of observation, one of the best, bears witness that he has often seen the wheat and barley fields overrun with darnel, and that the native owners stoutly declare that the good wheat which they sowed has been changed into the false in the process of growth during a single season; but he intimates at the same time that he believes the men are mistaken, and that the presence of the darnel must be attributed to some other cause, and accounted for in some other way.[12] The suggestion that the same peculiarities of season which destroy the sown wheat may favour the springing of the darnel, that had lain in the ground dormant before, may possibly account for the present experience of the Syrian cultivators; or the effects may be in whole or in part due to other causes of which we are not cognizant; but the solution of this question is by no means essential to the right interpretation of the parable, and therefore we shall not prosecute the investigation further in this direction. [12] "The Land and the Book." Note by Principal Fairbairn in translation of "Lisco on the Parables."