Centres of origin

[John Grehan]

Peter Hovenkamp wrote:

>Mmm - interesting. So if I try to explain the currently pantropical
>distribution of, say, Nephrolepis multiflora to the best of my ability and
>on basis of the currently accepted knowledge, I am participating in a
>metaphysical research program?

According to Craw and Weston, yes.

>Reading a little bit between the lines, I feel that such questions to John
>Grehan are not part of Science.

In what respect? Please clarify.