BOOK V.

SENESCENCE AND DEATH.

I. THE DIFFERENT POINTS OF VIEW FROM WHICH DEATH MAY BE REGARDED 307

II. CONSTITUTION OF THE ORGANISMS. PARTIAL DEATH. COLLECTIVE DEATHS 312

III. PHYSICAL AND CHEMICAL CHARACTERISTICS OF CELLULAR DEATHS. NECROBIOSIS 321

IV. APPARENT PERRENNITY OF COMPLEX INDIVIDUALS 330

V. IMMORTALITY OF THE PROTOZOA AND OF SLIGHTLY DIFFERENTIATED CELLS 334

VI. LETHALITY OF THE METAZOA AND OF DIFFERENTIATED CELLS 340

VII. MAN. THE INSTINCT OF LIFE AND THE INSTINCT OF DEATH 345

INDEX 361

LIFE AND DEATH.