The vast commerce of Liverpool enables those resident in it to observe some very interesting mineralogical facts, though its position among the gently undulating hills of the New Red Sandstone deprives them of the opportunity of collecting indigenous minerals.

Having in the course of the past few years specially studied some of the chrysocolla ores imported there, I have been very much struck with the vast differences to be detected in most of their physical characters. These differences in fact are of such importance, as will be seen in the sequel, that I have thought it advisable to mention them to some of our ablest English mineralogists and at their request I have been tempted to insert a record of them in the pages of the Mineralogical Magazine.