510 ([return])
[ See Humboldt, Fragments Asiatiques, p. 386: Barton's Geography of Plants: and Malte Brun. In the latter work it is said that the limit of the growth of trees in Siberia may be drawn under the parallel of 70 degs.]
511 ([return])
[ Sturt's Travels, vol. ii. p. 74.]
512 ([return])
[ A Gaucho assured me that he had once seen a snow-white or Albino variety, and that it was a most beautiful bird.]
513 ([return])
[ Burchell's Travels, vol. i. p. 280.]
514 ([return])
[ Azara, vol. iv. p. 173.]