Note 84 — Chapter I · THE CONTRIBUTION OF THE ANCIENT WORLD

Posidonius understood, from observation of differences between the Indians and Ethiopians dwelling in the same latitude, that latitude was not the only determining element in the distribution of natural products and races of man but that other factors should also be given consideration (Berger, Geschichte, 1903, p. 557). Peschel, Geschichte, 1877, p. 226, wrote that in the Middle Ages Jordanus of Severac was the only man to recognize the fact that a meridian may mark the boundary between dissimilar areas of plant or of animal life. See, however, Giraldus Cambrensis’ observations on this matter (see above, p. 177).