OF SEVERAL PARTS OF WESTERN ASIA. 



385 



356, 357, 358, which appear to be trachytic lava and trachytic 

 conglomerate. The trachyte occurs also at Sedicui. (Nos. 

 359, 360.) 



The specimens of stratified rocks sent me from the vicinity of 

 Smyrna, will not enable me to throw much light upon that part 

 of its geology. No. 327 is clay slate. No. 326, a sort of bastard 

 mica slate, or perhaps graywacke slate, of which No. 325 is a 

 more distinct example. No. 328 appears as if it might be a gray- 

 wacke sandstone. But I suspect limestone to be the predominant 

 rock. Sometimes it is compact, (No. 305,) like the limestones 

 akeady described from Syria and Palestine. Sometimes (Nos. 

 303, 304) brecciated ; portions of it, usually in irregular veins, being 

 red, from the abundance of peroxide of iron. This rock is used 

 at Broosa as marble, and occurs on mount Olympus, near that 

 place (Nos. 166, 167, 252) ; also in the island of Rhodes. (No. 

 42.) Some varieties of it, when weathered, have a dirty appear- 

 ance. (Nos. 309, 310, 313, 314.) In one instance (No. 324 from 

 Sedicui) we find limestone of a gray color, connected with clay 

 slate ; and the probability is, that much of it may be of the same 

 age as that rock. In none of the specimens do I discover any 

 trace of ors^anic remains. The b^-ecciated limestone. No. 3G8, 

 from Sedicui, has an aspect somew lat chalky ; but it is made up 

 of hard compact fragments. Nos, 311, 312, from the same place, 

 appear to be deposits from water, probably of comparatively re- 

 cent date. No. 311, especially, shows in its delicate stratified or lam- 

 inated arrangement, the marks of deposition; although it is 

 considerably crystalline. As we might expect from the facts 

 abeady stated respecting the warm springs near Smyrna, the 

 waters generally of the springs there, deposit large quantities of 

 carbonate of lime. No. 320 is -a curious example. It is the half 

 of an earthen-ware aqueduct, five inches in diameter, entirely 

 filled with these deposits. Several layers of crystalline carbonate 

 of lime appear to have been formed at first in the lower part of 

 the pipe, and then small roots nearly filled up the passage, around 

 which the calcareous matter accumulated, so that it exhibits pre- 

 cisely the appearance of a mass of petrified w^orms. But some 

 of the fibres still remain. Were these all gone, the specimen 



