Vorlesungen Über Allgemeine Natürliche Geometrie und Liesche Transformationsgruppen

This is the gold standard in books on Plane Curves etc, and their analysis using
Intrinsic Coordinates. It opens doors that weren't known to exist heretofore.
Cesaro has shown his knowledgae of other European authors, who have dabbled in
Intrinsic Coordinates for a special purpose, but then Cesaro extends all their
findings and adds a plethora of his own.
The mathematics is translated exactly by Gerhard Kowalewski into a German
translationn about 1906, bu then about 20 years later Kowalewski wrote a book on
Lie Groups using all of Cesaro's maths, but this time the presentation of the
maths is better and more rigorous and lucid display of the methods of that later
era. I put him and Kowalewski on the same highy pedestal of great
mathematicians.
David Halprin