CHAPTER V.. The Work of Graham.

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--Woehler prepares urea--Dumas opposes the dualistic system of Berzelius--Liebig's conception of compound radicles--His work in animal and agricultural chemistry 252