Silico-Fluoride of Calcium.

The name Lapis Albus was given by Dr. Grauvogl to a species of gneiss found held in suspension in the waters of the mineral springs of Gastein.

A trituration has also been made from the gneiss rock which is found in the Tauern Mountains, but that from the springs will probably be found the most reliable.

A notice will be found in Hale's New Remedies.