The intensity of intellectual and manual application which Leonardo threw into the work is proved by the fact that he finished it within four years, in spite of all his other avocations and of those prolonged pauses of concentrated imaginative effort and intense self-critical brooding to which we have direct contemporary witness.
The simplicity and symmetry of his sentences, the modulations of his thrilling voice, the radiance of his fine face, even his slight hesitations and pauses over his manuscript, lent a strange charm to his speech.
If the wing was inelastic, every part of it would reverse at precisely the same moment, and its vibration would be characterized by pauses or dead points at the end of the down and up strokes which would be fatal to it as a flying organ.
All through, the letter shows the breaks and pauses of a mind in direct contact with some personal crisis.
It is characteristic of early literature that the evolution of the thought - that is, the grammatical form of the sentence - is guided by the structure of the verse; and the correspondence which consequently obtains between the rhythm and the grammar - the thought being given out in lengths, as it were, and these again divided by tolerably uniform pauses - produces a swift flowing movement, such as is rarely found when the periods have been constructed without direct reference to the metre.