[B55]

In Watson's Cybele Britannica, considering only Dicot., there are, (not considering those genera & species, which from var several causes of doubt are not numbered by Watson) 395 Genera & 1031 species; but of these the "Aliens" (I have not excluded the Colonists & Denizens) ie those presumed or certainly known to have been originally introduced from other countries, & the few Sarnian & Hibernian species may be excluded, leaving 374 genera and 940 926 species, (For there are 91 aliens including about 9 Hibernian & Sarnian; there are only about 6 cases of more than one species of a genus being an alien, so that there are nearly as many genera as species in the aliens; this is curious, & I think is due to same cause as Coral isld inhabitant belonging to so many Families & genera; & depends on a great diversity of structures or genera being favourable to support of life.)

Hence the [illeg] aboriginal Dicot. have (374) 940 926 (2.51) in each genus 2.51 species. 374/926/2.47.

Of these some probably aboriginal (ie excluding Aliens & Hibernians) these, extending over all, or 18 or 17 Watsonian Provinces of England & Scotland, 179 genera having 308 species. That is, in each of the Provinces these 308 species are found: Thus hence same genus does not generally have many species wide ranging.— These 308 species belong to genera, which have (excluding alien species) on an average (179/652/3.64) each 3.64 species; ie those genera, which have one or more species ranging over whole area, are larger genera than average, which average is 2.51. Hence, the concern viz these genera 195 with 288 species which have not even one wide ranging species, have on average only 1.47 species, or are now small genera.