PART I.

INTRODUCTION Page 1 CHAP. I. Prevalence of Doctrine of Atmospheric Contagion, Injury to Patient, Attendants, and Visitors 7 CHAP. II. Medicine retarded—Forms of Contagion 18 CHAP. III. Historical Sketch 25 CHAP. IV. The Absence of Sufficient Evidence of the Existence of Atmospheric Contagion 36 CHAP. V. Contagious Poisons—Non-Solution in the Air—Results of Experiments 40 CHAP. VI. Contagious Poisons, compared with Yeast—Does that agent assume the Aeriform State? 50