PHYSICAL ASPECT. 



139 



there, the water of which contains a little sulphured 

 ed hydrogen and deposits oxide of iron. The baths 

 of Bareto are very agreeable, but their temperature 

 is very nearly that of the atmosphere. The geognos- 

 tic constitution of that group of serpentine is worthy 

 of particular attention from its isolation, its veins, 

 its connection with the syenite, and its elevation 

 through formations filled with petrified shells. 



A feldspar, with base of soda (compact feldspar), 

 forms, with diallage, the euphotide and serpentine 

 rocks ; with hypersthene it forms hypersthenite; with 

 hornblende, diorite ; with augite, dolerite and basalt ; 

 and with granite, eclogite. These five rocks dis- 

 persed throughout the globe, charged with oxidized 

 iron and mixed with sphene, have in all probability 

 a similar origin. In the euphotides two formations 

 are easily distinguishable ; one wanting hornblende, 

 even when it alternates with hornblende rocks (Joria 

 in Piedmont, Eegla in Cuba), and abounding in pure 

 serpentine, metallized diallage, and sometimes jasper 

 (Tuscany, Saxony); and the other heavily charged 



sarmentosa ; Ehretia havanensis ; Cordia globosa ; Convolvulus 

 pinnatifidus ; C. calycinus ; Bignonia lepidota ; Lagascea mollis 

 Car. ; Malpighia cubensis ; Triopteris lucida ; Zanthoxylum ; Pte- 

 rota ; Myrtus tuberculata ; Mariscus havanensis ; Andropogon ave- 

 naceus Schrad. ; Olyra latifolia ; Chloris cruciata ; and a large 

 bumber of Banisteria, whose gilded flowers adorn the scene. — See 

 our Florula Cuba insula, in the Nov. Genera Spec. — H. 



