[15] Smithsonian Contributions to Knowledge, vol. i.
[16] The Indian Islands and Madagascar.
[17] Viz. the Korana, Saab, Hottentot, and Bushman.
[18] The Agow, Somauli, and the rest; some being spoken very far north, as the Agow and Seracolé. This list has already been published by the author in his Report on Ethnological Philology (Transactions of the Association for the Advancement of Science, 1847).
[19] A table showing this is to be found in the Transactions of the British Association for 1847, &c., [pp.] 224–228.
[20] Transactions of the Philological Society, No. 33.
[21] A short table of the Berber and Coptic, as compared with the other African tongues, may be seen in the Classical Museum, and in the Transactions of the British Association, &c. for 1846. In the Transactions of the Philological Society is a grammatical sketch of the Tumali language, by Dr. L. Tutshek of Munich. Now the Tumali is a truly Negro language of Kordofan; whilst in respect to the extent to which its inflections are formed by internal changes of vowels and accents, it is fully equal to the Semitic tongues of Palestine and Arabia.
[22] Nothing is said about Cape Horn; as America in relation to Asia is an island. It is also, perhaps, unnecessary to repeat that both the rate and the centre are hypothetical—either or both may or may not be correct. That which is not hypothetical is the approximation to an equability of rate in the case of continents. It is difficult to conceive any such conditions, as those which deferred the occupancy of islands like Madagascar and Iceland, by emigrants from Africa or Greenland, for an indefinite period, keeping one part of Africa or Greenland empty whilst another was full. Hence, the equability in question is a mere result of the absence, on continents, of any conditions capable of arresting it for an indefinite period. The extent to which it may be interfered with by other causes is no part of the present question.