Reactions to On the Origin of Species is also right". The "Saturday Review" reported that "The controversy excited by the appearance of Darwin's remarkable work on the "Origin of Species" has passed beyond the bounds of the study and lecture-room into the drawing-room and the public street." The older generation of Darwin's tutors were rather negative, and later in May he told his cousin Fox that "the attacks have been falling thick & heavy on my now case-hardened hide.— Sedgwick & Clarke opened regular battery on me lately at Cambridge Phil. Soc. & dear old Henslow defended me in grand style, saying that my investigations were perfectly
On the Origin of Species this was a common pattern. Darwin discussed ways that species could be dispersed across oceans to colonise islands, many of which he had investigated experimentally. Chapter XII continues the discussion of biogeography. After a brief discussion of freshwater species, it returns to oceanic islands and their peculiarities; for example on some islands roles played by mammals on continents were played by other animals such as flightless birds or reptiles. The summary of both chapters says: ... I think all the grand leading facts of geographical distribution are explicable on the theory of migration (generally of the more dominant forms of