CHAPTER III. THE FORM OR SHAPE OF FLYING MACHINES
The Theory of Copying Nature. Hulls of Vessels.
Man Does not Copy Nature. Principles Essential, not
Forms. Nature not the Guide as to Forms. The Propeller
Type. Why Specially-designed Forms Improve
Natural Structures. Mechanism Devoid of Intelligence.
A Machine Must Have a Substitute for Intelligence.
Study of Bird Flight Useless. Shape of
Supporting Surface. The Trouble Arising From Outstretched
Wings. Density of the Atmosphere. Elasticity
of the Air. "Air Holes." Responsibility for
Accidents. The Turning Movement. Centrifugal Action:
The Warping Planes.

CHAPTER IV. FORE AND AFT CONTROL
The Bird Type of Fore and Aft Control. Angle and
Direction of Flight. Why Should the Angle of the
Body Change. Changing Angle of Body not Safe. A
Non-changing Body. Descending Positions by Power
Control. Cutting off the Power. The Starting Movement.
The Suggested Type. The Low Center of Gravity.
Fore and Aft Oscillations. Application of the
New Principle. Low Weight not Necessary with Synchronously-
moving wings.

CHAPTEB V. DIFFERENT MACHINE TYPES AND THEIR CHARACTERISTICS
The Helicopter. Aeroplanes. The Monoplane. Its
Advantages. Its Disadvantages. The Bi-plane. Stability
in Bi-planes. The Orthopter. Nature's Type
not Uniform. Theories About Flight of Birds. Instinct.