CHAPTER IV.
ESTABLISHMENT OF GENERAL PRINCIPLES OF CHEMICAL SCIENCE (continued)—PERIOD OF DAVY AND BERZELIUS.
Electro-chemistry—The dualistic theory developed by Berzelius—Davy's work on acids, alkalis, and salts—He proves chlorine to be an element—His discovery of the safety-lamp [155]
CHAPTER V.
THE WORK OF GRAHAM.
Graham traces the movements of molecules—He distinguishes between colloids and cystalloids—Dialysis [232]
CHAPTER VI.
RISE AND PROGRESS OF ORGANIC CHEMISTRY—PERIOD OF LIEBIG AND DUMAS.
The barrier between inorganic and organic chemistry begins to be broken down—Wöhler prepares urea—Dumas opposes the dualistic system of Berzelius—Liebig's conception of compound radicles—His work in animal and agricultural chemistry [252]