72
RICE UNIVERSITY STUDIES
FIGURE 6. The Logistic Curve: Growth of a population of yeast
cells, taken from R. Pearl (Rcf. 10).
SAfOf 77/AV Aff AfCfAArVOcZOtV
For the period up to 1855, r(t) = 10.109 + —— - nniilj-
I t 2.495e u uj 4
From 1855 on, P(t) = 33.587 + —^---------
'l+297.546e,,-°∙,7-'
FIGURE 7. Tlic population growth of Germany, showing two
cycles of growth which have overlapped during the
period of census history.