Introduction PART 1. PRINCIPLES OF HYGIENE Lesson One A.What is a Principle? B.Relationships between Living Things and Inert Matter. C.The Law of Vital Relation. D.The Law of Power. E.The Law of Selective Elimination. F.The Law of Dual Effect. Lesson Two A.The Law of Special Economy. B.The Law of Vital Distribution. C.The Law of Limitation. D.The … Continue reading Courses