BIRDS OF PREY OF NOVA SCOTIA—GILPIN. 255 
regards the specimen described in the Geology of Canada as 
representing rather a variety of Fayalite. The occurrence of a 
mineral, however, in Nova Scotia, resembling it so strongly, 
would show that it may be most properly considered a variety 
of lieorite. 
The mineral is principally found in Elba, at Rio la Marina 
and Cape Calmite, where it occurs in disseminated and grouped 
crystals. At one time the crystals were abundant, the finer 
specimens are now rare, and bring extravagant prices. On this 
Island it occurs in dolomite with pyroxene, etc. It has been 
found in Siberia, Silicia, and Norway. 
In America it was formerly obtained in Cumberland, Rhode 
Island, and Somerville, Mass., in long slender slightly rhomoboidal 
prisms, longitudinally striated and sometimes presenting terminal 
faces. These prisms are implanted on granular quartz with 
minute crystals of magnetite, but the supply now appears to be 
exhausted. 
The mineral I have shown you this evening is not considered 
to exist in quantities which would lead to any hope of its find- 
ingan economic value. Its decomposition, however, would supply 
percxides of iron, and compounds such as these may have formed 
a most important source for many valuable iron ore deposits 
occurring in strata succeeding the Laurentian. 
ArT. [V.—ON THE Brireps oF Prey or Nova Scotia.—By J. 
BERNARD GILPIN, A. B., M. D., M.R.C.S. 
(Read 10th Jan., 1881.) 
In making this list I have personally identified, with one or 
two exceptions, every species in it. I will not say that no other 
specimen may be added, but that if hereafter noted, it will be a 
very rare one to have escaped my notice of more than thirty 
years. Personal identification of each species also by the writer, 
even if in a narrow limit, adds always to the interest and value 
of a paper. In classification I have used Key to N. American 
Birds, by Dr, Coues, 1872, of the value of which it scarcely needs 
