When on board H.M.S. Beagle, as naturalist, I was much struck with certain facts in the distribution of the organic beings inhabiting South America, and in the geological relations of the present to the past inhabitants of that continent.
B.M.S.aren Beagle itsasuntzian naturalista nenbilela, arreta biziro piztu zidan Hego Amerikan bizi diren izaki organikoen banaketan eta kontinente hartako oraingo eta iraganeko biztanleen arteko erlazio geologikoetan ageri diren zenbait egitatek.