Rare and antique natural history books, biology sciences, zoology, mineralogy, geology antique discoveries

First edition of this lecture given to the Belgian Society of Philosophy on May 11, 1929.
Autograph inscription from the author on the front cover.

First edition, false statement of edition.
A rare and very good copy.

First edition.
A rare and very good copy, despite occasional small foxing.

First edition.
Ex dono to endpaper, a good and rare copy.

First edition published in a small number of copies.
A small tear at head of spine, otherwise a rare and handsome copy.

First edition.
Spine split and reglued at head and foot with two small lacks, some foxing.

First edition published in a small number of copies of this offprint.
Booklet illustrated with figures.
Rare and handsome copy.

First edition of this mathematical pamphlet against the theory of relativity.
Small tears without consequence to spine and boards, otherwise handsome copy.
Rare.

First edition.
Tiny corner chip to front cover, another at foot of spine, otherwise handsome copy.

First edition.
Work illustrated with 8 figures.
Spine sunned, otherwise handsome copy.

First edition.
Preface by Albert Einstein.
One tear without loss to page 58.

First edition.
Work illustrated with figures.
Spine faded, otherwise handsome copy complete with its errata leaf.

First edition.
A good copy.

First edition, one of 520 numbered copies on tinted laid paper, the only issue with 1 Japan, 1 Montval, 58 Montgolfier.
Concerning notably A. Einstein.

First edition.
A good copy.
Rare.

First edition.
A rare and good copy.

First edition.
A rare and good copy.

First edition.
A rare and good copy.

First edition.
A rare and good copy.

First edition.
A rare and good copy.

First edition of these theses defended to obtain the degree of doctor of science with Mr. Chasles as thesis director.
A small tear at the foot of the spine, otherwise a handsome copy complete with its folding plate at rear.
Rare.

First edition.
Autograph inscription by the author on the front cover.
Work illustrated with 3 figures.
Handsome copy.

First edition.
Ex dono to head of title page.

New edition of the French translation expanded with an alphabetical table of matters presenting technical definitions and relationships between bodies.
Half-shagreen binding in plum, smooth spine decorated with gilt and blind fillets.
Minor foxing of no consequence, a tiny tear without loss and not affecting the text on page 185, otherwise handsome interior condition.