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File consists of 11 packs of index cards with copies of the letters written from Hugh J. Macdonald to Professor Williamson.

File consists of copies and originals of personal correspondence from a number of individuals including Professor Williamson's mother, sisters, wife, and Lady A. Macdonald.

File consists of letters of recommendation/ testimonials for Mr. Williamson and "Varsity Class Cards" from the University of Edinburgh from 1821-29.

File consists of a book entitled "Diagrams of Natural Philosophy", which in it contains pages with full colour images illustrating theories and mechanisms of hydraulics, motion and machinery, mechanical powers, magnetism, hydrostatics, properties of bodies, pneumatics, acoustics, optics, electricity, and chemistry.

File consists of both a framed and negative images of Rev. Dr. Williamson, LL.D.

File consists of documents written in French, consisting of letters, articles, essays, diagrams, instrcution booklets, and a coloured illustration of a steam engine.

The fonds consists of fifty-two letters from Sir John A. Macdonald, ranging in dates from 1849-1891; one hundred and fifty-three letters from Hugh John Macdonald, from 1880-1895, twenty-seven letters from Lady Macdonald and Louise Macdonald and three hundred and sixty-seven letters and testimonials of a personal nature. These letters mostly concern the upbringing and education of Williamson's son, James Gilchrist Williamson and other family matters. There are a few expense accounts for the boy's education from his grandfather, John Gilchrist. There are also a number of university attendance cards, dating from Williamson's student days in Edinburgh. Also included are lectures, sketches, sermons and personal mementos. Of particular local interest is material pertaining to the Kingston Observatory.

File consists of letters from the Royal Astronomical Society, a deed to land which Queen's purchased from the City in order to erect an observatory, letter from the Bank of Upper Canada, a cataloug of observations of Circumpolar stars from The Royal Obseratory in Cape Town, letters from the Marine Department of Canada, And telegraphs and letters from the Meterological Office in Toronto.

File consists of fragments of lectures, predominantly on astronomy, as well as a handfull of speeches given by Professor Williamson at Queen's.

File consists of fragments of lectures and speeches given by Professor Williamson.