not as instruments of suffering but as objects typical of the occupation of the departed in this life, in accordance with the habit of their pagan forefathers, which the Roman Christians had adopted. Some, however, of the stones, as I have said, may have been used according to the popular legend for the drowning of martyrs; and these weights were conveniently at hand in places of public resort, and lent themselves readily, by the rings inserted in many of them, to the persecutor's purpose. The material of which they are composed is in nearly all cases the same. It is a stone of extreme hardness and of various shades of colour, from a light green to a dark olive, with a degree of transparency equal to that of wax and susceptible of a fine polish. By some writers it is called a black stone; but this colour may have been given to it by frequent handling when in use, and by the grime of age since. It was called by the Romans, from the use made of it in fabricating measures of weight, _lapis aequipondus_, and from its supposed efficacy in the cure of diseases of the kidneys _lapis nephriticus_. Fabreti says that it got the name of _lapis Lydius_ from the locality from which it was believed to have come. It is a kind of nephrite or jade, a mineral which usually occurs in talcose or magnesian rocks. At one time it was supposed to exist only on the river Kara-Kash, in the Kuen Luen mountains north of Cashmere, and for thousands of years the mines of that locality were the only known worked ones of pure jade. It has since, however, been found in New Zealand and in India; while the discoverers of South America obtained specimens of it in its natural state from the natives of Peru, who used it for making axes and arrow-heads, and gave it the name of _piedra de yjada_, from which comes our common word _jade_, on account of its use as a supposed cure for the iliac passion. It may be mentioned that there is a mineral closely allied to jade called "Saussurite," discovered by the great geologist whose name it bears near Monte Rosa, and since found on the borders of the Lake of Geneva, near Genoa, and in Corsica. It is possible that the martyr-stones may be made of this mineral, for they have not been analysed. But if they are, as it is supposed, made of true jade, the fact opens up many important questions.