Quotes About Solid bodies

Accordingly, we find Euler and D'Alembert devoting their talent and their patience to the establishment of the laws of rotation of the solid bodies. Lagrange has incorporated his own analysis of the problem with his general treatment of mechanics, and since his time M. Poinsot has brought the subject under the power of a more searching analysis than that of the calculus, in which ideas take the place of symbols, and intelligent propositions supersede equations.

Nature knows nothing but solid bodies; your science deals only with combinations of surfaces. And so nature constantly gives the lie to all your laws; can you name one to which no fact makes an exception?