OCR Text |
Show Seeing Plants Grow. In the laboratory the growth of ablant may be rendered visible by attaching a fine platinum wire to the stem or Growing Grow-ing part The other end of the w e, to which is fastened a pointed piece of Lhar-coal, Lhar-coal, is pressed gently against a c rum. The drum is covered with white iaper and kept revolving Dy ciockwih . . Of course if the growth is stationary a straight line is marked on the ijper, but even the slightest increase is Blown bv the inclined tracing Vjgjf. |