A "micro-vivisection" apparatus so delicate that it enables scientists to dissect living cells has been perfected by Professor C. E. Tharaldsen, of the Department of Zoology, Northwestern University. It consists of a brass lever moved by three finely adjusted screws, manipulating special glass needles which can be brought to bear upon a cell suspended in a drop of nutrient fluid under the lens of the microscope. The needles, the essential part of the machine, are finer than hairs and are formed like a "J" or an "L." The apparatus is superior to similar devices...
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