of the Specular Iron-Ores of Santiago de Cuba. 425 
tures of the original coralline mass when overwhelmed and 
lifted. 
Courses of chloritic material of the above description encase 
the lower ends, at least, of all the ore-bosses wherever terminal 
parts have been uncovered by excavations. These conform to 
are to be referred, as above, to exfoliated insoluble residuums. 
They are similar in type to the intrusions of siliceous material 
within the compass of the ore-bodies. The decomposition of 
dyke-like ramifications zn sctu is seen to result in a product 
detritus in the parent coralline. This may be supposed to 
The terminal parts of only the lower and more accessible 
ends of the ore-bodies have thus far been exposed by excava- 
tions at the base of the hills, and just back of the contact, 
where, in the course of its convolutions, this conforms to the 
southerly course of streams. ‘T'he longer axes of the ore-bodies 
are therefore transverse to such parts of the beds of streams as 
have been eroded along the contact. Only where assuming a 
longitudinal direction has the contact, for obvious reasons, pre- 
sented to erosion the line of least resistance. 
The chloritic courses immedigtely encasing the ore-bosses 
ifts. Hence a divisional structure resembling that of an 
Onion, and easily mistaken for bedding. The shell-like divis- 
ions, elsewhere described as transition parts of ore-bosses, give 
way inside to massive ore divisionally arranged as above 
instanced. The conditions of the central and nether parts 
tendency is decidedly acid from segregations of quartz or 
from intercalations of jasper. As returned by numerous average 
