Through the kindness of Prof. and Mr. John Young, F.G.S., I have been enabled to examine a number of unclassed minerals belonging to the Hunterian Collection in the Museum of the University of Glasgow. Among them I have found some whose composition differs from anything already described, and it is with the hope that mineralogists may be enabled to identify them elsewhere, that I now publish a detailed account of them. I am sorry that it is impossible for me to state the localities of some of the minerals, owing to the fact that they were unnumbered and unknown specimens, which were found in olcl drawers of the museum when the collection was being removed to the new buildings, but as the minerals with which they are associated are characteristic, we may obtain some clue to the deposits in which they originally lay. I shall describe the minerals in the order of their complexity, giving the least complex the first place.