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As these become fully appreciated and invariably observed, further facts may be successively introduced: in the one case, the numbers of stamens and pistils, the forms of the flowers, whether radial or bilateral in symmetry, the arrangement and character of the leaves, whether opposite or alternate, stalked or sessile, smooth or hairy, serrated, toothed, or crenate; in the other, the divisions of the body, the segments of the abdomen, the markings of the wings, the number of joints in the legs, and the forms of the smaller organs the system pursued throughout being that of making it the child's ambition to say respecting everything it finds all that can be said.
And our ancestor was almost certainly a free swimming gastræa, or hypothetical form corresponding in form and structure to the gastrula. The ancestor of man never settled down lazily into a sessile life. But how is an adult worm or vertebrate formed out of such a gastrula? To answer this would require a course of lectures on embryology. But certain changes interest us.
Filaments very slender, tubular, continuous, filled with colored, granular, transversely striated substance; seldom blanched, though often cohering together so as to appear branched; usually massed together in broad floating or sessile strata, of a very gelatinous nature; occasionally erect and tufted, and still more rarely collected into radiating series bound together by firm gelatine and then forming globose lobed or flat crustaceous fronds.
Beeches, elms, maples, lindens, pawpaws, tulip trees, here attain a monster growth, with grape-vines, their fruit now set, hanging in great festoons from the branches; and all about, are the flowers which thrive best in shady solitudes wild licorice, a small green-brier, and, although not yet in bloom, the sessile trillium.
And think of what else he says of it: 'Ovary ovoid, stigma sessile, undulate, seeds covering the lateral placenta, each enclosed in an aril. Now it may be safe for pigs and billy-goats to tackle such a compound as that, but we boys all like to know what we are eating, and I cannot but feel that the public health officials of every township should require this formula of Dr.
Cirripedes afford a good instance of this: even the illustrious Cuvier did not perceive that a barnacle was a crustacean: but a glance at the larva shows this in an unmistakable manner. So again the two main divisions of cirripedes, the pedunculated and sessile, though differing widely in external appearance, have larvae in all their stages barely distinguishable.
In the centre of each blue blossom is a small white spot. The blossoms grow in little clusters on a short stalk, and on this stalk there is always one pair of small leaves. The leaves on the main stems of the plant are larger; the lower leaves have stalks, but those on the upper part of the stem are sessile. The leaves are hairy, and so are the stems, which often grow two or three feet high.
Multiple Chondromas and Osteomas of the Synovial Membrane. In this rare type of loose body, the surface of the synovial membrane is studded with small sessile or pedunculated tumours composed of pure hyaline cartilage, or of bone, or of transition stages between cartilage and bone.
Mexico, 1839. This is a very distinct and beautiful Mexican species that will only succeed around London as a wall plant. It grows about a yard high, with leaves fully 3 inches long, having three terminal sessile leaflets, and slender leaf stalks often 2 inches long. The ternate leaflets are of a glaucous blue colour, marbled with dull green, and very delicately veined.
And, as if to make the case as striking as possible, this sessile cirripede was a Chthamalus, a very common, large, and ubiquitous genus, of which not one specimen has as yet been found even in any tertiary stratum.
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