Molecular and atomic volumes CHAPTER XXXVI.

DIFFUSION AND CONDENSATION OF GASES.

Diffusion of gases.--Law of diffusion.--Cause.--Liquefaction and
solidification of gases

CHAPTER XXXVIL

SULPHUR.

Separation.--Crystals from fusion.--Allotropy.--Solution.--
Theory of Allotropy.--Occurrence and purification.--Uses.---
Sulphur dioxide

CHAPTER XXXVIII.

HYDROGEN SULPHIDE.

Preparation.--Tests.--Combustion.--Uses.--An analyzer of metals.-
-Occurrence and properties

CHAPTER XXXIX.

PHOSPHORUS.

Solution and combustion.--Combustion under water.--Occurrence.--
Sources.--Preparation of phosphates and phosphorus.---
Properties.--Uses.--Matches.--Red phosphorus.---Phosphene