Modern biology is not in a position to display the results of systematic research in a system of
concepts, or to represent the orderly behavior which is common to its objects in a general theory.
The place of theoretical science is taken rather by a heterogeneous multitude of facts,
problems, views and interpretations... Such a state of affairs cannot be improved upon by the
piling up of new facts and opinions upon the old ones, but only by a fundamental re-organization.
-- Schaxel, 1922
This { i.e., Schaxel's } view sees the essential feature of life in its character as a system,
and the chief task for biology in the future is the establishment of the laws of biological
systems.
-- Bertalanffy, 1933
70 years later, we have a ways to go.