Aldrich, Thomas Bailey, 1836-1907 · Boston, CT : Hall and Locke · leaf 396
ll-wall. Every cell gener-ally contains within it a denser, normally spheroidal,body known as the nucleus. Now protoplasm is a very unstable substance — as wehave seen many substances are whereof nitrogen is acomponent part — and it possesses active propertieswhich are not present in the… … tion of protoplasm, an internal circulation of currentsin definite lines will establish itself from other causes. Inorganic bodies, as we have seen, will expand withheat, as they may also do from imbibing moisture; butliving protoplasm has an apparently spontaneous powerof contraction and expansion…
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