Note 51 — THE TESTIMONY OF THE ROCKS. (continued 8)

Since these sentences were written I have seen a description of both the plants of the Upper Old Red to which they refer, in an interesting sketch of the geology of Roxburgshire by the Rev. James Duncan, which forms part of a recent publication devoted to the history and antiquities of the shire. "In the red quarry of Denholm Hill there occurs," says Mr. Duncan, "a stratum of soft yellowish sandstone, which contains impressions of an apparent fucoid in considerable quantity. One or several linear stems diverge from a point, and throw off at acute angles, as they grow upwards, branches or leaves very similar to the stem, which are in turn subdivided into others. The width of the stalks is generally about a quarter of an inch, the length often a foot. The color is brown, blackish-brown, or grayish. The same plant also occurs in the whitestone quarry [an overlying bed] in the form of Carbonaceous impressions. There can be little doubt that it is a fucoid. The general mode of growth greatly resembles that of certain seaweeds; and in some specimens we have seen the branches dilated a little at the extremities, like those of such of the living fuci as expand in order to afford space for the fructification. It is deserving of remark, that the plant is seldom observed lying horizontally on the rock in a direction parallel to its stratification, but rising up through the layers, so as only to be seen when the stone is broken across; as if it had been standing erect, or kept buoyant in water, while the stony matter to which it owes its preservation was deposited around it." Mr. Duncan, after next referring to the remains of what he deems a land plant, derived from the same deposit, and which, though sadly mutilated, presents not a little of the appearance of the naked framework of a frond of Cyclopterus Hibernicus divested of the leaflets, goes on to describe the apparent calamite of the formation. "The best preserved vegetable remain yet found in Denholm Hill quarry," he says, "is the radical portion of what we cannot hesitate to call a species of calamite. The lower part is regularly and beautifully rounded, bulging and prominent, nearly four inches in diameter. About an inch from the bottom it contracts somewhat suddenly in two separate stages, and, from the uppermost sends up a stem about an inch in diameter, and nearly of the same length, where it is broken across. At the origin of this stem the small longitudinal ridges are distinctly marked; and the whole outline of the figure, though converted into stone, is as well defined as it could have been in the living plant." Mr. Duncan accompanies his description with a figure of the organism described, which, however, rather resembles the bulb of a liliaceous plant than the root of a calamite, which in all the better preserved, specimens contracts, instead of expanding, as it descends. The apparent expansion, however, in the Old Red specimen may be simply a result of compression in its upper part: the under part certainly much resembles, in the dome-like symmetry of its outline, the radical termination of a solitary calamite.