CONTENTS 9 



Exercise Page 



62. Structure of Seeds 91 



63. Seed Dispersal 93 



64. Conditions for Germination 93 



65. Seedlings 95 



66. Bacterial Cultures 97 



67. Conditions for Bacterial Growth 100 



68. Root Tubercles 101 



69. Tests for Foodstuffs 103 



70. Foodstuffs in Common Foods 104 



71. Study of the Mouth (home study) 105 



72. Alimentary Canal and Digestive Glands 



(Demonstration) 107 



73. Digestion in the Mouth 109 



74. Digestion in the Stomach 110 



75. Digestion in the Intestine 112 



76. Absorption 113 



77. Study of Beef "Pluck" (Demonstration)... 114 



78. Blood 116 



79. Respiratory Organs and Mechanics of Res- 



piration (Demonstration) 118 



80. Comparison of Expired and Inspired Air. . . . 120 



81. School Ventilation 122 



82. The Kidneys 123 



83. The Skin 124 



84. The Skeleton 125 



85. Structure and Composition of Bone 127 



86. Levers 128 



87. Muscles (Demonstration) 130 



88. Nervous System (Demonstration) 131 



89. Cutaneous Sensations 133 



90. Organs of Taste and Smell 134 



91. Organ of Sight 135 



92. Organ of Hearing 1 137 



