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The extreme points of some of the branchlets are rolled up so as to resemble the croziers or circinate vernation of ferns; the leaves or bracts, a, supposed to belong to the same plant, are described by Dawson as having inclosed the fructification. The remains of Psilophyton princeps have been traced through all the members of the Devonian series in America, and Dr.
In the Balm of Gilead, the leaf is involute, rolled towards the midrib on the upper face. Other kinds of vernation are revolute, the opposite of involute, where the leaf is rolled backwards towards the midrib; circinate, rolled from the apex downwards, as we see in ferns; and corrugate, when the leaf is crumpled in the bud.
It has opened up to those whose pursuits confine them within the limits of the city's smoke-cloud, a means whereby they may obtain 'a peep at nature, if they can no more. Far removed from green fields and leafy woods, they may, for instance, enjoy their leisure mornings in watching one of the most beautiful phenomena of vegetable development the evolution of the circinate fronds of the fern; a plant in every respect associated with elegance and beauty.
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