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	hhoke and his discovery of cells
	ROBERT HOOKE is regarded as the inventor of a useable two-lensed microscope. He observed sap-containing ducts with it and noticed walls in them, which he interpreted as valves. His main work "Micrographia" (1667) contains a number of observations made with the aid of a microscope; the most important of them are the depictions of the cork tissue. HOOKE recognized this fact and called the units he saw in this tissue cells. As a well-trained mathmatician and physicist he calculated their number to be 1000 per square inch. Besides his microscopical studies, he, too, worked on physiological processes and postulated that the snapping off of the leaf of Mimosa pudica was caused by the excretion ("exhaling") of a very delicate liquid. Approximate Word count = 407 Approximate Pages = 1.6 (250 words per page double spaced)

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