ee 
CHAPTER VII. 
THe MACHINERY OF FLIGHT. 
The Breastbone and the Connected Bones — Muscles and 
Quality of Muscle—The Scaffolding of the Wing—Pneu- 
matic Bones—Stiffness of Wing—Expanse of Bone— 
The Spreading of the ee of a Maes 
Feather—Moulting—Legs ; 
CHAPTER VIII. 
VARIETIES OF WING AND OF FLIGHT. 
Curve—Narrow and Broad Wings—Styles of Sess a oie 
in Flocks—The Whir of Wings 
CHAPTER -IX. 
Pace AnD Last. 
Experiments and ae halal aa apenas oe ds of ne 
tory Flights—Endurance : d's 
CHAPTER X. 
WIND AND FLIGHT. 
Rising—Flight with the Wind—Undulating Flight 
without Movement of the Wings—Advance in a Direct 
Line without Movement of Wing—Advance Sideways 
in‘ a Direct er ee ee in a Horizontal 
Wind Impossible. . me a ai ; 
CHAPTER XI. 
Some ACCESSORIES. 
Digestion—Circulation, Breathing, Temperature—Repair 
of the Machine—Call-notes and Song te ; 
Vili 
67 
91 
103 
. 120 
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