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Show Invisible "Keep Out" Sign Makes Roots Stay Apart Washington. "No trespassing" trespas-sing" signs are written in some kind of unexplored chemical language by growing roots, to keep other roots from invading territory which they have taken tak-en for their own. Indications of this are graphically shown in a device invented by Prof. M. A. Raines of Howard university. ! Professor Raines' new method makes the root system of plants visible throughout their entire growth. Against a slightly sloping sheet of glass he lays a sheet of dark paper or other absorbent material, ma-terial, kept moist by a series of wicks dipped into a supply of water. The roots sprouting from seeds placed at the top edge of the sheet grow down the moist paper, and can be studied in detaiL |