CHAPTER XL.

ARSENIC.

Separation.--Tests.--Expert analysis.--Properties and
occurrence.-- Atomic volume.--Uses of arsenic trioxide

CHAPTER XLI.

SILICON, SILICA, AND SILICATES.

Comparison of silicon and carbon.--Silica.--Silicates.--Formation
of silica.

Chapter XLII

GLASS AND POTTERY.

Glass an artificial silicate.--Manufacture.--Importance.--
Porcelain and pottery.

CHAPTER XLIII.

METALS AND THEIR ALLOYS.

Comparison of metals and non-metals.--Alloys.--Low fusibility. --
Amalgams

CHAPTER XLIV.