... that a geologist might say they are evidently all of the same formation. Such the author believes all true genera really to be, while their species and varieties depend on characters of less importance. Such groupes usually themselves point out a...
Saxifragearum enumeratio: Accedunt Revisiones plantarum succulentarum - Seite vi
von Adrian Hardy Haworth - 1821 - 269 Seiten