Formation of veins. 207 i C H A P. X. AN ABRIDGED ACCOUNT OF THE PRINCIPAL METALLIC VEIN FORMATIONS WHICH OCCUR IN THE MINING DI STRICT OF FREYBERC. § ”3- I shall conclude this treatise with a short applica tion of my theory to the mining district of Freyberg, by describing the different formations of metallic veins which I have observed in it. This description will not only serve to explain and elucidate my theo ry, but may also be regarded as the beginning of a description and more exact knowledge of the di strict of Freyberg. By it the practical miner of this country will be enabled to form a more correct knowledge of the nature of the repositories which he works. It will also assist in the practical study of veins those who come here to study mineralogy and geognosy;