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he writes at second hand. In some cases again, although the style
and expressions used make it seem highly probable that he has
derived his information from others-- though, as it seems to me,
these cases are not very numerous--we find, on the other hand, among
these topographical notes a great number of observations, about
which it is extremely difficult to form a decided opinion. Of what
the Master's life and travels may have been throughout his
sixty-seven years of life we know comparatively little; for a long
course of time, and particularly from about 1482 to 1486, we do not
even know with certainty that he was living in Italy. Thus, from a
biographical point of view a very great interest attaches to some of
the topographical notes, and for this reason it seemed that it would
add to their value to arrange them in a group by themselves.
Leonardo's intimate knowledge with places, some of which were
certainly remote from his native home, are of importance as
contributing to decide the still open question as to the extent of
Leonardo's travels. We shall find in these notes a confirmation of
the view, that the MSS. in which the Topographical Notes occur are
in only a very few instances such diaries as may have been in use
during a journey. These notes are mostly found in the MSS. books of
his later and quieter years, and it is certainly remarkable that
Leonardo is very reticent as to the authorities from whom he quotes
his facts and observations: For instance, as to the Straits of
Gibraltar, the Nile, the Taurus Mountains and the Tigris and
Euphrates. Is it likely that he, who declared that in all scientific
research, his own experience should be the foundation of his
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