Word: visional
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Dates: during 1930-1939
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...past winter, acts were thought up, men and animals bought up, the show licked into shape. Besides a whole battery of rodeo and roughrider acts, McCoy devised an elaborate pageant that would give a new generation a vision of the old West-cowboys & Indians, stagecoaches & covered wagons, ranches & Indian villages...
...placed inside the cylinder, which is then turned slowly by hand. If the animal makes eye or head movements following the rotation, it is assumed that it can see the stripes. Their width is progressively diminished until the animal stops turning its eyes- thus showing that its threshold of vision has been reached. For sharp-eyed creatures which can easily follow the the 1/16th inch stripes, a further refinement is achieved by using slender threads, the finest of which were especially woven for Warkentin's experiments. The cylinder technique was used in Germany 15 years ago, but only...
...White rats, white mice and Gila monsters showed no response at all, presumably have extremely poor vision...
...Frogs, toads, alligators and opossums showed weak responses, have poor vision...
...Snakes, contrary to popular supposition, have good vision. Those tested included garter snakes, king snakes, ribbon snakes and rattlesnakes. They see worst just before shedding their skins, best just after shedding, because the snake's cornea grows opaque as shedding time nears and is sloughed off with the skin...