CHAPTER LIII.

CHEMISTRY OF ROCKS.

Classification.--Composition.--Importance of siliceous rocks.--
Soils.--Minerals.--The earth's interior.--Percentage of elements

CHAPTER LIV.

ORGANIC CHEMISTRY.

Comparison of organic and inorganic compounds.--Molecular
differences.--Synthesis of organic compounds.--Marsh-gas.
series.---Alcohols.--Ethers.--Other substitution products. --
Olefines and other series.

CHAPTER LV.

ILLUMINATING GAS.

Source, preparation, purification, and composition.--Natural gas

CHAPTER LVI.

ALCOHOL.

Fermented and distilled liquors.--Effect on the system.--Affinity
for water.--Purity