“perhaps the greatest intellectual stride that it has ever been granted to any man to make”— Einstein on Newton’s PrincipiaNEWTON ,ISAAC
Philosophiae Naturalis Principia Mathematica. London: for the Royal Society by Joseph Streater, 1687
First edition of Isaac Newton’s Principia, “generally described as the greatest work in the history of science” (PMM). This is an excellent, entirely unrestored copy of the first state with the preferred two-line imprint.
Carte-de-visite Photograph Album. Down, Kent, 1871-1879
An intimate photographic memento of Charles Darwin and his family. This extremely rare Darwin family photograph album contains photographs of Charles Darwin (1809-1882) and his wife Emma Darwin (1808-1896).
WATSON, JAMES D. & FRANCIS CRICK
“Molecular structure of nucleic acids. A structure of deoxyribose nucleic acid.” Offprint from: Nature Vol. 171 (April 25, 1953). London, 1953
FIRST EDITION, THE RARE OFFPRINT. Signed by Watson and Crick. This volume is also inscribed and signed by Maurice Wilkins and Alec R. Stokes, co-authors of the second paper with H R. Wilson. Wilkins shared the 1962 Nobel Prize in Medicine with Watson and Crick.
WATSON ,JAMES and FRANCIS CRICK
“Molecular structure of nucleic acids. A structure of deoxyribose nucleic acid.”. Offprint from: Nature Vol. 171 (April 25, 1953) , April 25, 1953
FIRST EDITION, THE RARE OFFPRINT. Signed by Watson and Crick on the first page and thus eminently suited for exhibition.
two items: $75,000
VON NEUMANN ,JOHN, ET AL
Ergebnisse eines mathematischen Kolloquiums, unter Mitwirkung Kurt Gödel und George Nobeling. Herausgegen von Kurt Menger. Heft 1-8.. Leipzig & Berlin: B. G. Teubner and F. Deuticke, [1931-1937].
A rare complete run of first editions of the proceedings of the celebrated Vienna Colloquium.
Iconic signed Darwin photograph “I like this photograph much better than any other which has been taken of me.”(DARWIN, CHARLES.) CAMERON, JULIA MARGARET
Portrait of Charles Darwin, signed by Darwin and by Cameron. Cameron, 
THE ICONIC PORTRAIT OF CHARLES DARWIN, boldly signed by Charles Darwin and by Julia Margaret Cameron.
Experiments and Observations in Soaring Flight. Offprint from: Journal of the Western Society of Engineers 8 [misprinted “III” on front wrapper], no. 4 (August, 1903). [Chicago], 
FIRST EDITION, offprint issue. Presentation copy with the stamp of the Wrights’ advisor, mentor, and chief promoter, aviation pioneer Octave Chanute. Chanute was the most important figure in aviation from 1890 to 1910
On the Economy of Machinery and Manufactures. London: R. Clay for Charles Knight, 1832
First edition. LARGE-PAPER COPY, presentation copy inscribed by Babbage to Sir Robert Peel, one of the leading British politicians of the day.
SCHIRRA, WALTER M.
A Complete Set of Schirra’s Flight Log Books documenting his entire career as a Navy pilot and a NASA astronaut. Various places, Jan 1947—Feb 1953; Mar 1953—Jan 1954 (‘duplicate’); Mar 1953—Sep 1958; Oct 1958—May 1967; Jun 1967—Jun 1969
This is a complete set of Wally Schirra’s official flight log books, meticulously maintained by him over more than two decades from his earliest days in training through his fabled career as a fighter pilot, a military test pilot, and one of the “Original Seven” American astronauts.
Autograph Letter Signed [to Henry Denny]. Down, Kent, June 1, 
VERY EARLY DARWIN INVESTIGATION OF THE RACES OF MAN. In 1834 Darwin heard that head lice vary among the races of man while on the voyage of the Beagle. In his Beagle zoological diary he wrote, “Mr Martial, a surgeon of an English Whaler assures me that the Lice of the Sandwich Islanders … if they strayed to the bodies of the English in 3 or 4 days died … If these facts were verified their interest would be great.— Man springing from one stock according his varieties having different species of parasites.— It leads one into many reflections.” Intrigued by the implications of this observation, Darwin began collecting specimens for further research.