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Eucalyptus Globulus, the Australian gum tree, has opposite and broadly sessile leaves during the first years of its life. Later these disappear and are replaced by long sickle-shaped foliage organs, which seem to be scattered irregularly along the branches.
A sessile mussel chained to a rock seeks little but the fundamentals of nutrition and generation and these in a simple way. An animal that builds habitations for its young, courts its mate, plays, teaches and fights, may do nothing more than seek nutrition and generation, but it seeks these through many intermediary "end" points, through many impulses, and thus it has many types of satisfaction.
In a memoir on Fossil Sessile Cirripedes, I stated that, from the large number of existing and extinct tertiary species; from the extraordinary abundance of the individuals of many species all over the world, from the Arctic regions to the equator, inhabiting various zones of depths, from the upper tidal limits to fifty fathoms; from the perfect manner in which specimens are preserved in the oldest tertiary beds; from the ease with which even a fragment of a valve can be recognised; from all these circumstances, I inferred that, had sessile cirripedes existed during the secondary periods, they would certainly have been preserved and discovered; and as not one species had then been discovered in beds of this age, I concluded that this great group had been suddenly developed at the commencement of the tertiary series.
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.
Sessile ear 12 " 20 " Scaphoid fossa prolonged to lobe 8.2 " 21.2 " Projecting ears 3.1 " 5.3 " Prominent anti-helix 11.5 " 14.2 " Darwin's tubercle 3 " 2.9 " If Lombroso's theory, that a man was born a criminal, was to be taken as the rule, Manouvrier declares that it must then be universal, and that men thus born must inevitably commit crime.
Look at the common oak, how closely it has been studied; yet a German author makes more than a dozen species out of forms, which are almost universally considered by other botanists to be varieties; and in this country the highest botanical authorities and practical men can be quoted to show that the sessile and pedunculated oaks are either good and distinct species or mere varieties.
And if we wish to analyze more closely, we discover two kinds of leaf-buds, those that send forth a rapidly growing shoot bearing the leaves, and those from which the leaf-cluster remains practically sessile on the branch. These latter, or the strongest and best of them, will probably give rise to short fruiting spurs and the others to elongated leafy branches.
The knowledge of anomalous auricles is lost in antiquity. As a rule, supernumerary auricles are preauricular appendages. Warner, in a report of the examination of 50,000 children, quoted by Ballantyne, describes 33 with supernumerary auricles, represented by sessile or pedunculated outgrowths in front of the tragus.
The leaves grow in pairs, and the small bare stalks which carry a flower at their ends spring from the stem beside the leaves. The leaves are sessile on the stem. Turning a leaf over we find that on its under side are black or dark purple spots. The blossoms of the Pimpernel close up when rain is near, and it is often called the Poor Man's Weatherglass.
The most remarkable feature is the shape of the leaves. They are broader and shorter, and especially at the base they are broadened in such a way as to become apparently sessile. The stalk is very brittle, and any rough treatment may cause the leaves to break off.
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