[66] Draba aretoides has been found on Chimborazo at 16,000 feet.
[67] Poa annua grows at an elevation of 7400 feet.
[68] Aristotle, "Hist. Animal.," i. 9.
[69] Pliny, "Hist. Nat.," xi. 52.
[70] Pliny, "Hist. Nat.," xxx. 7, 12, 24.
[71] Pliny, "Hist. Nat.," xi. 36.
[72] Newman, "Introduction to the History of British Insects."
[73] Ptolemæus, "Syntaxis Mathematicalis," iii. 3.
[74] Certain astronomical calculations, so called because begun under the patronage of Rudolf II., Emperor of Germany (1576-1612).
[75] Kepler, "Astronomia Nova, seu de Motibus Stellæ Martis," p. 53 (ed. 1609).