The day will assuredly come when men will see that it is a grave question; at which period, also, I doubt not, there will arise persons able to investigate it. For the present, the movements of the world seem little likely to be influenced by botanical law; or by any other considerations respecting trees, than the probable price of timber. I shall limit myself, therefore, to my own simple woodman's work, and try to hew this book into its final shape, with the limited and humble aim that I had in beginning it, namely, to prove how far the idle and peaceable persons, who have hitherto cared about leaves and clouds, have rightly seen, or faithfully reported of them. FOOTNOTE: [1]: In our own National Gallery. It is quaint and imperfect, but of great interest. CHAPTER II. THE LEAF ORDERS. § 1. As in our sketch of the structure of mountains it seemed advisable to adopt a classification of their forms, which, though inconsistent with absolute scientific precision, was convenient for order of successive inquiry, and gave useful largeness of view; so, and with yet stronger reason, in glancing at the first laws of vegetable life, it will be best to follow an arrangement easily remembered and broadly true, however incapable of being carried out into entirely consistent detail. I say, "with yet stronger reason," because more questions are at issue among botanists than among geologists; a greater number of classifications have been suggested for plants than for rocks; nor is it unlikely that those now accepted may be hereafter modified. I take an arrangement, therefore, involving no theory; serviceable enough for all working purposes, and sure to remain thus serviceable, in its rough generality, whatever views may hereafter be developed among botanists.