10 
TOWER OF HERCULES. 
mountains rise gradually. The secondary formations crcnth 
• n 1 ^P p , ear ’ aud aro . succeeded by the transition rocks which 
indicate the proximity of primitive strata, \V<- found con- 
siderable mountains composed of that ancient srav stone 
which the mineralogists of the school of Freyoer- name 
pauwciMe, and ffrauwakjccnscliitfcr. I do not know whether 
haslSw'v! 1 ’ W a‘ Ch 18 a< 5 *oq»entin the south of Europe 
fn£rmenW b T^^ C °f Veredm ° thei “P arts of Spain. .Angular 
tragments of Lj chan stone, scattered along the rallies seemed 
of “wj 5° Sltl0n se,list i3 tlie of the strata 
oi graywacke. IN ear Corunna even granitic ridges stretch 
to hav? Smfenfc gaL gran j tes ’ which s «‘'m formerly 
to have been contiguous to those of Britanny and Cornwall 
Siinl-Ti ‘tlm wa " rCCk -f ° fil cha ? 1 ot ' mountains destroyed and 
racte etfrrocl T Mld h f utiM cr -' stals of 5 W 
uiaiaaense this rock. Common tm ore is sometimes disco 
r r, V ng t ’“ e mincs isiX laborious and unnro- 
■ltable operation for the inhabitants of Galicia 
.1 he first secretary of state had recommended us verv oar 
liciiLariy to brigadier Don Eaphael Clavijo, who was em- 
ployed in forming new dock-yards at Corunna He advised 
!' S t0 on board the sloop Pi zarr0) * ill was to sail 
m company with the Alcudia, the packet-boat of Em month 
ol May , which, on account of the blockade, had been detained 
three weeks m the port. Senor Clavijo ordered the necessan 
aiiangements to he made on board the sloop for placing our 
instruments, and the captain of the Pizarro received orders 
to stop at Tenenffe, as long as we should jmfoe necessary to 
mZJt “ e >T‘ W»S»d £ S 
mollusCc'e which the north-west winds had m t wifi r 
JZiTthe ZSA * the , StCC11 , ^ - STS 
slsolflt Ser,lXaSint 88 ^ 
loot high, its walls are fburKh! \Sh£l 
struction clearly proves that it was built by the Eomans An 
frigate (fragata lijera). 6 n0 “ ellclat “^ K»«° was a light 
