Where did [Charles] Darwin get all the information for his Origin of Species? Well, he got it largely… not just from the Beagle voyage, but also from the working out of the collections, and he devoted I believe it was eight years, for instance, to a monograph of the barnacles of the world. And it is almost invariably, except for Professor Ghiselin, been underestimated the lessons that Darwin learned from working on these collections. It isn't until you really study series of specimens, see the variation within the series, see how a population is structured, what the kind of variation it is that you find within a population, how it differs from a population that is on the next island, how much of the variation overlaps with this one – all these phenomena, you can't study them on a continent. And I would say that the study of islands, when it comes to the problem of speciation, teaches you far more than you could learn from anything else. And Darwin and [Alfred] Wallace were fortunate to have had that experience, so did [Erwin] Stresemann and [Bernhard] Rensch and so did I in New Guinea in the mountains, and in the Solomon Islands in the lowlands. It is an experience that cannot be replaced by anything else.