This is a preview. Log in through your library . Abstract The niche variation hypothesis is an adaptive explanation for variation within populations and for the differences in variation between ...

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 ...

IF, in Prof. Bateman's example, we take then and may be regarded as independent of each other, and the variational equations are It is true that the equation can be derived by adding these two ...