Having, since file date when the few observations chronicled in a previous number were made, ascertained some more definite facts with regard to these marbles, I now note these.

The localities in which I had previously observed the marble were all (through faulting and intrusions) so obscure as regards its relationships, that any conclusion as to its horizon was not warranted.

A complete description of this mineral was given in Poggendorf's Annalen, vol. 132 (1867), p. 372, by Prof. vom Rath, who ascribed it to the oblique system with the elements, a : b : c=·361639 : 1 : ·116825 ; β=87°40′18″.

This paper gives a full account of the appearance and properties of the Meneghinite from Scrravezza, and of its association with Quartz, Galena, Blends, Chalybite, Copper Pyrites, Iron Pyrites, Calcite, and Albite; the results of the analysis also accord fairly with the previous determinations of Bechi and Hofmann, which give for the formula Pb4 Sb2 S7 or 4Pb S + Sb2 S3.