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In the variety the branches are erect and the leaves inserted on all sides. When sporting, it returns to the bilateral prototype and flat wings of fan-shaped twigs are produced laterally on its dense broom-like tufts. Wherever this variety is cultivated the same reversion may be seen; it is produced abundantly, and even under seemingly normal circumstances.
The joints of the lower extremity are most commonly affected, and the disease is bilateral in a considerable proportion of cases both knees or both hips, for instance, being implicated. Among the theories suggested in explanation of these arthropathies the most recent is that by Babinski and Barré, which traces the condition to vascular lesions of a syphilitic type in the articular arteries.
Now it might be said that, as there exists an instinctive tendency to imitate visual forms by motor impulses, the impulses suggested by the symmetrical form are in harmony with the system of energies of our bilateral organism, which is a system of double motor innervations, and thus fulfill our demand for a set of reactions corresponding to the organism as a whole.
Langdell has called attention to a very important principle, and one which, no doubt, throws light on many decisions. /1/ This is, that, where you have a bilateral contract, while the consideration of each promise is the counter promise, yet prima facie the payment for performance of one is performance of the other.
The other boy in the family had a total absence of irides, but he could see fairly well with the left eye. Anomalies of the Ears. Bilateral absence of the external ears is quite rare, although there is a species of sheep, native of China, called the "Yungti," in which this anomaly is constant. Bartholinus, Lycosthenes, Pare, Schenck, and Oberteuffer have remarked on deficient external ears.
So in architecture, the effect of a contrast of masses often depends upon the sense of bilateral balance, symmetry, or equality, in which this visual error would naturally come into play.
The affection is not benefited by treatment, and while a horse's leg may become so heavy and cumbersome as to mechanically impede its gait, as well as to fatigue the subject when made to do service even at a slow pace, elephantiasis causes no constitutional derangement. The hind legs, in elephantiasis, are affected and a unilateral involvement is more often seen than a bilateral one.
Luxations attending some cases of influenza recover promptly when subjects are kept comfortably confined in roomy box-stalls. The administration of stimulative medicaments such as nux vomica and the application of an active blistering agent to the patella serve to hasten recovery. Dislocations in such cases are often bilateral and they are usually momentary.
But our little turbellaria, while still without a head, has one end which goes first and can be called the front end. The upper or dorsal surface is usually more colored with pigment cells than the lower or ventral surface, on which is the mouth. It has also a right and left side. It is thus bilateral.
In all such objects we therefore require bilateral symmetry. The necessity of vertical symmetry is not felt because the eyes and head do not so readily survey objects from top to bottom as from side to side.
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