. Age and area; a study in geographical distribution and origin of species. Biogeography; Evolution. CH. XXII] GEOGRAPHICAL DISTRIBUTION 237 one take the number of species per family in the British flora, one finds it to increase steadily with the number of genera; there are no breaks, as one would be inclined to expect. The families Monospccifi c Genera at th 13 end 0 f curve. Number of species (or size of area] Mixed curves, to show the close agreement of the hollow curves, whether derived from families of plants grouped by sizes of genera (Compositae, Hymenomycetineae, Simarubaceae), famili
. Age and area; a study in geographical distribution and origin of species. Biogeography; Evolution. CH. XXII] GEOGRAPHICAL DISTRIBUTION 237 one take the number of species per family in the British flora, one finds it to increase steadily with the number of genera; there are no breaks, as one would be inclined to expect. The families Monospccifi c Genera at th 13 end 0 f curve. Number of species (or size of area] Mixed curves, to show the close agreement of the hollow curves, whether derived from families of plants grouped by sizes of genera (Compositae, Hymenomycetineae, Simarubaceae), families of animals (Chrysomelidae, Amphipodous Crustacea, Lizards), endemic genera grouped by sizes (Islands, Brazil, New Caledonia), local floras grouped by (local) sizes of genera (Ceylon, Cambridgeshire, Italy), local faunas (Birds of British India, British Kcliinoderms), Tertiary fossils by sizes of genera, or Endemic Compositae of the Galapagos by area. [By courtesy of the Editor of Nature.] with one genus show an average of 2-2 species per family, those with two an average of 8-3, with three of 10-7, with four of 12-3, with five, six or seven genera of 15, with eight, nine, or ten of. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Willis, J. C. (John Christopher), 1868-1958. Cambridge [Eng. ] The University Press
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