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The proper drying of oils and their behavior with various siccatives in varying quantity is an interesting problem, and obviously of considerable importance from a practical standpoint.

For those drugs which are strong siccatives and absorb humour force the viscera when hardened into a tumour more completely into a quasi-stony body.

"A peculiar kind of Venetian glass," says Mr Eastlake, "used, when pulverised, as a dryer, contained a considerable portion of lead; and if it acted chemically, may have derived its siccative quality from that ingredient."

If you put a little siccative de Harlem in it, or use any picture varnish thinned with turpentine, it will serve well enough.

In his researches, he discovered the use of linseed and nut oil, which he found most siccative.