ANNOTATIONS AND ADDITIONS. 67 



when uncertain respecting his longitude, (February 1493), di- 

 rected himself by the appearance of the first floating streamers 

 of weed (de la primera yerva) on the eastern margin of the 

 great Corvo bank. The physical line of demarcation was, 

 by the powerful influence of the Admiral, converted on the 

 4th of May, 1493, into a political line, being made the 

 celebrated " line of demarcation" between the Spanish and 

 Portuguese rights of possession. (Compare my Examen 

 Critique, torn. iii. p. 64-99, and Cosmos, English ed. vol. ii. 

 p. 279-280.) 



(8) p. 3 t _ The Nomadic Tilbos and Tuaricks" 



These two nations inhabit the deserts between Bornou, 

 Fezzan, and Lower Egypt. They were first made known to 

 us with some exactness by Hornemann's and Lyon's travels. 

 The Tibbos or Tibbous roam through the eastern, and the 

 Tuaticks (Tueregs) through the western, parts of the great 

 desert. The first are called by the other tribes, from being 

 in continual movement, " birds." . The Tuaricks are distin- 

 guished into those of Aghadez and those of Tagazi. They 

 are often engaged as conductors of caravans, and in trade. 

 Their language is the same as that of the Berbers ; and they 

 belong unquestionably to the number of the primitive 

 Lybian nations. The Tuaricks present a remarkable phy- 

 siological phenomenon. Different tribes among them are, 

 according to the climate, white, yellowish, and even almost 

 black; but all are without woolly hair or Negro features. 

 (Exploration scientifique de TAlgerie, T. ii. p. 343.) 



