https://doi.org/10.2307/1218532 • https://www.jstor.org/stable/1218532 Copy URL Phenotypic variation is as poorly understood as it is ubiquitous. Many biologists ...

IN a review in NATURE 1 it is stated that the equation of conduction of heat can be regarded only as a limiting case of an equation arising in the calculus of variations. A successful attempt has been ...