575 



is feldspar, containing crystals of hornblende. Mr. von 

 Buch has discovered in the great Circus of the island of 

 Palma, which he considers as the ancient cratere de souleve- 

 ment, crater of eruption, another primitive rock. This also 

 consists of a feld-spar basis, containing garnets and actinolite 

 (strahlstein). In a neighbouring ravin, isolated blocks of 

 mica- slate with hornblende are observed. The gypseous and 

 limestone formations of Lancerota and Fortaventura (ib. p 

 236) are strata subordinate to the formation of volcanic tufs. 

 We even find there beds of oolites. According to Mr. von 

 Buch, to whom belong all the observations of this supple- 

 ment, the mean temperature of Santa Cruz in Teneriffe is 

 71*8° Fahr., or 21-8° Centigrade." 



In this Personal Narrative all the indications of tempera- 

 ture are reckoned in the degrees of the centesimal thermome- 

 ter, when the contrary is not expressly noted. The gene- 

 ric and specific names of plants printed in italics designate 

 genera or species unknown before our journey, and described 

 in our Nova Genera et Species Plantarum Orbis Novi. 



END OF VOL, ITI* 



W. Pople, Printer, 67, Chancery Lane. 



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