. Biology and man. Biology; Human beings. After eating. When larvae first hatch out of the eggs, they After their first feeding excursion, the larvae move up—toward the tips of the twigs, where move down—away from the tips—to a crotch, leaf buds are opening. But if the twig is bent where they spin a "tent". But if the twig is bent over, they still move up — away from their pro- over, the larvae still move down—toward the tips spective food of the bore twigs DO THE LARVAE KNOW WHAT THEY ARE DOING? The young larvae normally move toward the young leaves when they are hungry and away fro
. Biology and man. Biology; Human beings. After eating. When larvae first hatch out of the eggs, they After their first feeding excursion, the larvae move up—toward the tips of the twigs, where move down—away from the tips—to a crotch, leaf buds are opening. But if the twig is bent where they spin a "tent". But if the twig is bent over, they still move up — away from their pro- over, the larvae still move down—toward the tips spective food of the bore twigs DO THE LARVAE KNOW WHAT THEY ARE DOING? The young larvae normally move toward the young leaves when they are hungry and away from the leaf buds when they have filled up on food. But apparently they move up or down under different Internal conditions, even at the risk of going hungry —were "reflected" into a muscle. The nature of the force and the actual connection between the stimulus and the response were not worked out for nearly two hundred years. The idea was a helpful one, however, and the term reflex remains in use. And we make use of the fact too. For if you ever catch a fish with hook and line, your success depends upon a reflex. The fish responds to the sight of certain kinds of objects by snapping at them with its mouth. If the con- ditions are suitable, if you have the right kind of bait, if it is properly fastened to the hook, and if you drop it into the water at a suitable depth, your "luck" depends upon the presence of the fish and his seeing the bait. The reflex does the rest. This appears to be a mechanical act, like a tropism. We cannot 263. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gruenberg, Benjamin C. (Benjamin Charles), 1875-1965; Bingham, N. Eldred (Nelson Eldred), 1901-. Boston, New York, [etc. ] Ginn and company
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Keywords: ., book, bookcentury1900, booksubjectbiology, booksubjecthumanbeings
