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PREDICTIONS – 10 Years Later - Santa Fe Institute

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APPENDIX C<br />

RAILWAY NETWORKS GROW LIKE PLANTS<br />

APPENDIX FIGURE 3.3 The graph at the top represents the total mileage of<br />

railways in the United States. At the bottom, we see the growth in height of a<br />

sunflower seedling. ∗<br />

∗ The two graphs were published by Alfred J. Lotka, Elements of Physical Biology, (Baltimore,<br />

MD: Williams & Wilkins Co., 1925). The bottom graph is attributed to H.S.<br />

Reed and R.H. Holland, Proc. Natl. Acad. Sci., vol. 5, (1919); 135-144.<br />

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