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TABLE OF CONTENTS 
EXERCISE PAGE 
35. Bread Mold — Mucor.31 
36. Wood Destroying Fungi.32 
37. Wheat Rust.33 
38. Oat Smut.. •. . . 35 
39. Potato Scab. ' .35 
40. Yeast — Structure and Reproduction.35 
41. Yeast — Fermentation.36 
42. “Colds” Versus Good Health.37 
43. Bacteria — Structure.40 
44. Interrelations of the Organisms of a Hay Infusion . . 41 
45. The Growth of Bacteria.42 
46. Preservatives and Disinfectants.43 
47. The Effect of Heat Upon Bacteria. 44 
48. Organic Matter in Water.45 
49. The Removal of Sediment in Drinking Water.46 
50. The City Water Supply. •. . ..47 
51. A Survey of Unsanitary Conditions.48 
52. The Vertebrate Skeleton.49 
53. The Organs of the Chest and Abdomen of the Human 50 
54. The Throat and Nasal Passages of Man.51 
55. The Circulation of Man ..52 
56. The Effect of Exercise upon the Pulse Rate.53 
57. The Human Respiratory Organs.54 
58. Air in the Lungs.54 
59. The Action of the Ribs and the Diaphragm in Breathing 55 
60. Inherited and Acquired Characteristics ..56 
61. Variation.57 
62. The Amceba. 57 
63. The Paramecium.58 
64. The Fresh Water Hydra.60 
65. The Earthworm.61 
66. The Crayfish. 63 
67. The Locust (Grasshopper).66 
68. The May Beetle. 69 
69. The Squash Bug ..70 
70. The Cabbage Butterfly.71 
71. The Honeybee . 72 
72. The House Fly .. 72 
73. A Survey of Breeding Places of Flies and Mosquitoes 73 
74. Interrelations of Living Things.74 
75. Animal Reactions. 76 
76. Plant Reactions . 76 
