CONTENTS XI 



CHAPTER VII 

 Heredity 



PACK 



Prodigality of Nature io6 



Pathological Heredity 107 



Heredity Defined 108 



Importance of Law of Biogenesis 109 



Distinction Between Inherited and Congenital . . . m 



Chromosomes and Heredity 112 



Variation ii5 



Mendel 116 



Importance of Heredity 119 



CHAPTER VIII 



Some Applications of the Laws of Protoplasms 



Disease as Old as Life 123 



Public Health and Disease 125 



Disease Defined 127 



All Life Subject to Disease 129 



Disease in Dandelion 130 



Disease in Honey Bee 132 



Rattlesnake and Disease 132 



Mushrooms and Disease 137 



Immunity to Disease I39 



Antitoxines 140 



Prevention of Disease 143 



CHAPTER IX 



The Law of Sensation and the Nervous System 



OF Man 



Law of Sensation 146 



A Central Nervous System I49 



Motor and Sensory Cells 150 



The Fish Brain 151 



The Brain of Man 152 



Nerve Cells 154 



