. La vie de l'île; ou, les phénomènes et les causes des faunes et des flores insulaires, y compris une révision et une tentative de solution du problème des climats géologiques. CARTE DES GALAPAGOS ET DES CÔTES ADJACENTES DE L'AMÉRIQUE DU SUD. La teinte lumineuse montre où la mer est moins de 1,000 brasses de profondeur.les figures montrent la profondeur en brasses. Groupes d'îles que nous avons envisagé, ils sont situédans une mer comparativement calme, où les tempêtes sont de rares occurrences et même de forts vents presque inconnus. Ils traversent des courants sous-marins forts et constants, qui s'écoulent vers le CHAP. XIII.] LE GALAPxVGOS ISL

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. Island life; or, the phenomena and causes of insular faunas and floras, including a revision and attempted solution of the problem of geological climates. MAP OF THE GALAPAGOS AND ADJACENT COASTS OF SOUTH AMERICA. The light tint shows where the sea is less than 1, 000 fathoms deep.The figures show the depth in fathoms. groups of islands we have been considering, these are situatedin a comparatively calm sea, where storms are of rare occurrenceand even strong winds almost unknown. They are traversed byocean currents which are strong and constant, flowing towards CHAP. XIII.] THE GALAPxVGOS ISLANDS. 267 the north-west from the coast of Peru; and these physicalconditions have had a powerful influence on the animal andvegetable forms by which tlie islands are now inhabited. TheGalapagos have also, during three centuries, been frequentlyvisited by Europeans, and were long a favourite resort ofbuccaneers and traders, who found an ample supply of food in. MAP OF THE GALAPAGOS. The light tint shows a depth of less than 1, 000 fiithoms.The figures show the depth in fathoms. the large tortoises which abound there ; and to these visits wemay perhaps trace the introduction of some animals wliosepresence it is otherwise difficult to account for. The vegetationis generally scanty, but still amply sufficient for the support ofa considerable amount of animal life, as shoA^i by the cattle, 2G8 ISLAND LIFE. [pakt ii. horses, asses, goats, pigs, dogs, and cats, which now run wildin some of the islands. Absence of indigenous Mammalia and Amphibia.—As in allother oceanic islands, we find here no truly indigenous mam-malia, for though there is a mouse of the American genusHesperomys, which differs somewhat from any known species, wecan hardly consider this to be indigenous; first, because thesecreatures have been little studied in South America, and theremay yet be many undescribed species, and in the second placebecause even had it been introduced

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