Note {354} — Chapter VI · ON THE GEOGRAPHICAL DISTRIBUTION OF ORGANIC BEINGS IN PAST AND PRESENT TIMES

This is an illustration of the general theory of barriers (Origin, Ed. i. p. 347, vi. p. 494). At i. p. 391, vi. p. 544 the question is discussed from the point of view of means of transport. Between the lines, above the words “with that land,” the author wrote “Cause, formerly joined, no one doubts after Lyell.”