. Animal flight; a record of observation . 48 ANIMAL FLIGHT. Cheels when flex-gliding in an ascending currentof air over the battlements of the Agra Fort keep on alevel keel so long as they travel in a straight line. Henceit is difficult to see how speculations about ascendingcurrents can help us to understand the nature of cantedflex-gliding. I am acquainted with various dispositions of wingsand modes of flight that occur at one time of the dayand not at another, or at one season of the year and notat others. With our present knowledge it is not im-possible to suggest explanations of such cha
. Animal flight; a record of observation . 48 ANIMAL FLIGHT. Cheels when flex-gliding in an ascending currentof air over the battlements of the Agra Fort keep on alevel keel so long as they travel in a straight line. Henceit is difficult to see how speculations about ascendingcurrents can help us to understand the nature of cantedflex-gliding. I am acquainted with various dispositions of wingsand modes of flight that occur at one time of the dayand not at another, or at one season of the year and notat others. With our present knowledge it is not im-possible to suggest explanations of such changes. Buta mode of flight that occurs commonly in one year andrarely in another indicates the concurrence of meteoro-logical factors whose nature is at present completelyunknown. Two other forms of soaring flight remain to bementioned, namely, ease-gliding and lift-gliding. On any fine day after soarability has been estab-lished, a large number of birds of different species may beseen circling and gliding over the Jharna Nullah
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