Secondary Occurrences of Mnynetite. — Kimball. 19 
sharply diiferentiated. This product may be more particular- 
ly described as a reticulation of the epidotic mass with com- 
pact magnetite, one distinctive property of which is its ring- 
ing sound when struck with a hammer, a property common to 
similar products of alteration of dioritic dykes associated 
with the ferriferous replacements of coralline limestone in 
Cuba. 
Another physical property of the siliceous replacements or 
epigenic concentrations in eruptive material in common with 
all others which I have observed is a marked prismatic cleav- 
age, which also serves to distinguish them from derivatives of 
limestone, mineralogically identical, but the tendency of which 
to pronounced cleavage does not extend as a rule to minute 
subdivisional fractures. A third common characteristic in 
eruptive (epidotic and dioritic) paragenesis is the amorphous 
constitution of the ferriferous product except when in the form 
of distinct lenses as at Cheery creek, Kamloops lake, British 
Columbia. Distinguishing criteria, thus noted, are observed 
not only in all occurrences of the kind on the islands of British 
Columbia, but also in such as I have visited in the Cascade 
mountains — namely on Money creek, at Snoqualmie pass 
(Denny claims), and again on the Cle-Elum river, as well as in 
the Santiago district of Cuba. 
Both types of ore bodies are seen in juxtaposition at the 
Prescott mine on Texada — the replacement of marble as far as 
it is developed being complete, and, as usual without transition 
or incipient stages. The product is densely subcrjstalline, and 
of remarkable compactness and richness. The conversion how- 
ever is only partial, the front portion of a detached mass of lime- 
stone only having been replaced with magnetite together with 
its two ends, the back portion adhering to the cliif, and the 
whole mass of ore passing with characteristic changes of 
physical qualities and of material into compass of the diorite. 
The alteration of the diorite appears to have been through an 
epidotic transition, the locus having been determined by planes 
of jointing. Further internal development of ore has follow- 
ed planes of cleavage. Hence a reticulated mass of epidote 
varying extremely in its admixture with ore. Taking the 
two kinds of product as forming a single ore-body, it may be 
succinctl}' described as a partial replacement of a detached 
