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| The names given to the various lines of a tooth on a gear-wheel are as follows: In Figure 233, A is the face and B the flank of a tooth, while C is the point, and D the root of the tooth; E is the height or depth, and F the breadth. P P is t... Read more of Drawing Gear Wheels at How to Draw.ca | Informational Privacy |
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The Wonderful Human BrainAccording to the novel computations of a renowned histologist, who has been calculating the aggregate cell forces of the human brain, the cerebral mass is composed of at least 300,000,000 of nerve cells, each an independent body, organism, and microscopic brain so far as concerns its vital functions, but subordinate to a higher purpose in relation to the functions of the organ; each living a separate life individually, though socially subject to a higher law of function. The lifetime of a nerve cell he estimates to be about sixty days, so that 5,000,000 die every day, about 200,000 every hour, and nearly 3,500 every minute, to be succeeded by an equal number of their progeny; while once in every sixty days a man has a new brain. Next: Mourning Colors The World Over Previous: How The Baby's Mind Develops
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