Notwithstanding the massiveness and elongation of the neck vertebrae, which are nearly twice as long as those of the back, the neck is sometimes only about half the length of the skull.
A similarelongation of those bones is seen in Porpoises, which also have a long snout; and the bones are carried back from the front of the head to the nostrils, which are sometimes known as blowholes.
These bones are elongated in a way that may be compared, on a small scale, with the elongation of the wing finger in the fore limb.
One character especially deserves attention in the apparent successive elongation of the first three phalanges in the wing finger in Dimorphodon.
Thirdly, the great elongation of the third wing phalange.
One remarkable feature common to all the specimens is the great elongation of the shin bones relatively to the thigh bones.
They are a compensation for weakness that would otherwise arise from the elongation of the neck, supporting, as it did, such a large head.
In the region of the head there is a considerable elongation of the pre-oral part, forming a short snout, at the end of which is placed the suctorial disc.
The whole phenomenon appears to me to be very simple, and to be caused by the elongation of the dorsal region, i.
The part of the spindle which remains in the egg becomes directly converted into a second spindle by the elongation of its fibres without passing through a typical nuclear condition.
They consist mainly in the elongation of the third division, and its conversion into a coiled tubulus, which then constitutes the main mass of each segment of the kidney.
If this distance diminishes with the elongation of the primitive streak then clearly the second of the two alternatives is out of the question.
Our view as to the elongationof the primitive streak appears to be that adopted by Gerlach.
Some have fancied that the elongation of the lower jaw in the male, which is somewhat in the form of a crook, is designed by nature to enable him to excavate the spawning trough.
Condensation and Elongation of slate Rocks by lateral Pressure.
May not their position in the slates have been determined by the movement of elongation before alluded to?
There must be physical continuity between parent, or parents, and offspring, so that the offspring is, as Erasmus Darwin well said, a kind of elongation of the life of the parent.
The wing-feathers are not elongated nearly so often as the tail-feathers; for their elongation would impede the act of flight.
The sexes differ also in the proportional size of the head and mouth, and in the position of the eyes;[11] but the most striking difference is the extraordinary elongation in the male (fig.
Iron very good; thirty rods in a faggot 5 + 6, and welded and drawn down into 3/8 of an inch square: an enormous elongation of the fibres.
Hence elongation is retarded and finally stopped even without a change in the earth's general climate.
Again, where the topography or the location of oceans or dry areas causes the glacial lobes to be long and narrow, the elongation of the lobe is apparently checked in several ways.
The circumstance in this phenomenon which appears to have particularly arrested Newton's attention, was the elongation which the luminous spot underwent in consequence of its passage through the prism.
The elongation may again be seen when the sun is setting.
The Atlantic salmon and the trout show also some elongationof the jaws, but not to the same extent.
Other fishes, as the eels, are extremely long and slender, and some carry this elongation to great extremes.
With the elongation of the body and its increase in flexibility there is a tendency toward the loss of the paired fins, the ventrals going first, and afterwards the pectorals.
Note: The proboscis of an elephant is a flexible muscular elongation of the nose.
Defn: An instrument for measuring the extension of a body, especially for measuring the elongation of bars of iron, steel, or other material, when subjected to a tensile force.
In general the drawing-machine is so adjusted, that the chief elongation takes place between the second and third pairs of rollers, while that between the first and second is but slight and preparatory.
This elongation of 20 feet proceeds evidently from the straightening of the twist in each link, which can take place only by impairing the strength of the cable.
The heat may be clearly referred to the prodigious friction among the particles of so cohesive a metal, when they are made to slide so rapidly over each other in every direction during the elongation and squaring of the rod.
The elongation of stems and linear leaves, and the reduction of lateral organs in darkness, is manifestly an adaptation.
The new types of green dahlia however, with which I have now to deal, are distinguished by the elongation of the axis of the head, which is thereby changed into a long leafy stalk, attaining a length of several inches.
To meet it, a very great majority of seed-forming plants have acquired the power of accelerated elongation of the stems when deprived of their normal amount of light.
The excessive elongation of stems is accompanied by variations in the structure and contents of the tissues.
When this retarding action is eliminated excessive elongation ensues.
The adaptiveelongation is not shown by all species, however.
Among the pleasant, we esteem a final and agreeable melioration of the climate, which regained most of its ancient character, and a rapid and distinctelongation of our caudtz, by a sudden acquisition of wisdom.
Most trees in their mature state make all their growth by extension or elongation very early in the season, by one push, as it were; with the first unfolding of the leaves, comes also the elongation of the twig that bears them.
It will be seen from the cut below that some of the peculiarities of the 'Gloriana' form are embodied in this singular craft--namely, the long overhang and the rounded elongation of the bilge to the extreme limits of the bow and stern.
This unusual degree of overhang gave an opportunity for the elongation of the body of the yacht, the fulness of the bilge being extended quite to the extreme point of the bow and stern.
The foot in the Dwarf-Lemurs is long, on account of the elongation of two of its ankle-bones (the cuboid and the naviculare).
