¿Qué es un grupo grande de hechos (large groups of facts)?  Acaso el autor, incapaz de reconocer su incompetencia en taxonomía y en historia natural, se propone ahora clasificar los hechos en general?   396 Many large groups of facts are intelligible only on the principle that species have been evolved by very small steps. For instance, the fact that the species included in the larger genera are more closely related to each other, and present a greater number of…