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The matter of diseased feet has been placed on the skin lining the cleft of a healthy foot under a variety of circumstances—sometimes when that skin is in its ordinary and natural state, sometimes after a very slight scorification, sometimes when macerated by moisture; and under each of these circumstances the disease has been communicated.

Various assays are described and directions given for crucible, scorification, and cupellation tests.

Under the most favourable conditions there is a slight loss of gold and silver in the fusion, the scorification and the cupellation, both by absorption in the slag and by actual volatilization and absorption in the cupel.

The first is conducted in one of two ways, known respectively as the crucible method and the scorification method.

In the scorification method one-tenth of an “A.T.” is the amount commonly taken.