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The second work, De Motu Animalium, deals with the mechanical action of the limbs of birds and animals and with a theory of the action of the internal organs. A section of the first part of this work, called De Volatu, is a study of bird flight; it is quite independent of Da Vinci's earlier work, which had been forgotten and remained unnoticed until near on the beginning of practical flight.
By 1680 Giovanni Borelli had reached the conclusion, in his book De Volatu, that it was impossible that man should ever achieve flight by his own strength. Nor was he more likely to do so in the first aerial ship, designed in 1670 by Francesco Lana, which was to be buoyed up in the air by being suspended from four globes, made of thin copper sheeting, each of them about 25 feet in diameter.
Palma is victory. I observed, that the character of Nicholson, in this book resembled that of Burke: for it is said, in one place, 'in omnes lusos & jocos se saepe resolvebat ; and, in another, 'sed accipitris more e conspectu aliquando astantium sublimi se protrahens volatu, in praedam miro impetu descendebat . JOHNSON. 'No, Sir; I never heard Burke make a good joke in my life . BOSWELL. 'But, Sir, you will allow he is a hawk. Dr.
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