The flight of birds! Aerial Locomotion by Man Made Easy. Dr. R.O. Davidson, (Author of the "Song of the Wood Thrush") will deliver a lecture on his new theory of the flight of birds, embracing a Plan for the Practical Imitation of these Animals on the Wing, at The Assembly Rooms, Louisana Avenue, on Tuesday evening, October 30, '60. The subject will be illustrated by a large diagram and spread eagle exhibited before the Audience, and all of the most striking Evolutions of Birds in the air, including that hitherto inexplicable Exhibition, performed by certain Large-winged ones of ascending into the Aerial Regions by merely circling around upon motionless wings will be fully and truthfully explained. Men of Science, Artists, Architects, Engineers, Artizans, and Mechanics and the citizens generally, who may be present, will hear much both new and highly interesting ...