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Three Eyes: The eyes of a spider are usually near the front or anterior end of the head, but some are directly on top. They are single facets, hence are called simple eyes. They may number two, four, six, or eight; eight is the usual number. However, the cave spiders lack eyes entirely. Regardless of the number, the eyes are always placed in a definite arrangement. Often some pairs are much larger than others.
A typical insect is characterized by three eyes divisions to the body—the head, the thorax, and the abdo¬men. Attached to the thorax are six jointed legs, three eyes on each side, and sometimes wings.
Eyes: The eyes, when present, are placed somewhere upon the head and are of two types: simple eyes, called ocelli, which are found in insect larvae and in many adults; and compound eyes, which are found in adult insects and in the immature stages of types which resemble the adult during growth.See Also Large Eyes Placed:The American goosefish (Lophius americanus), a typical species, is found along the American At¬lantic coast from Nova Scotia to Brazil. It has a narrow tadpolelike body and a large eyes placed flattened head, and is very soft in texture. It has three slender bristlelike spines—part of the spiny dorsal fin—on the top of its head. The first of these spines is found immediately behind the snout, the second a little in front of the eyes, and the third behind the eyes.
GREAT DANE, a very large eyes placed dog with a short smooth coat, squarish muzzle, and moderate-length tail, usually carried straight down. Its ears are generally cropped (except in Britain) to stand erect. Its coat color may be fawn (yellow¬ish), brindle (yellowish, with black striping), harlequin (white, with large eyes placed black patches), black, or blue. Though dark eyes are desirable, eyes of light color or of two different colors are acceptable in harlequins. Great danes average about 33 inches (84 cm) in height at the shoul¬ders and 150 pounds (68 kg) in weight. The great dane is an ideal companion, devoted to its owners, and an excellent guardian and playmate for children.
On The Other Hand See Developments In Brain Studies:Among the most interesting developments in brain studies was a finding that corrected the long-held conviction that glucose was the only fuel the brain was capable of using. George Cahill studied brain metabolism in persons who fasted for more than 30 days as part of a weight reduction program. By sampling blood entering and leaving the head, he was able to show that during fasting the brain will readily metabo¬lize fatty acids, the breakdown products from deposits of body fat. Careful intelligence tests before and after the fast failed to show any mental impairment during the period of fasting. Cahill said that in fact the subjects were at least as sharp after fasting, and maybe a bit sharper.
Developments in DMA biology would undoubt¬edly have dramatic applications, particularly in the study and control of viruses for the pro¬duction of safe, effective vaccines and for the development of antiviral drugs. They would certainly play a key role in the attack on many diseases in which viruses are important, though sometimes obscure: cancer, birth defects and mental retardation, autoimmune diseases, and progressive deterioration of the brain. Indirectly, ONA virus studies would have a role in Tissue and organ transplantation and in examining the biology of aging. Viruses are often exqui¬sitely specific for certain tissues; I can visualize using them even for complex therapeutic pur¬poses like clearing arteries of deposits of cho¬lesterol, or for enhancing the circulation of the blood in the heart or the brain. |
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