DISCOURSES

AND

MATHEMATICAL

DEMONSTRATIONS,

concerning two new sciences

Pertaining to

MECHANICS & LOCAL MOTIONS,

by Signor

GALILEO GALILEI LINCEO,

Philosopher and Chief Mathematician to the Most Serene

Grand Duke of Tuscany.

With an Appendix on the center of gravity of certain Solids.

Printer's mark of the Elzevier family (officina Elzeviriana). It depicts an elderly man standing under a large elm tree that is entwined by a fruiting grapevine. To the left, a ribbon scroll is wrapped around the tree trunk with the Latin motto "NON SOLUS" (not alone).

IN LEIDEN,

At the house of the Elzeviers. 1638.