Dissertatio in propositiones physicomathematicas de natura iridos R. P. Balthassaris Conradi ...

Marci of Kronland (Johannes Marcus)

Dissertatio in propositiones physicomathematicas de natura iridos R. P. Balthassaris Conradi ...

Description: FIRST EDITION, with an engraved plate (loose), ff. [36], small 8vo, [bound with:] Anatomia demonstrationis habitae in promotione academica die 30 Maii Per R.P. Conradum ... De angulo quo iris continetur. Same place, printer and date, with a folding engraved plate (loose), FIRST EDITION, ff. [20], 2 works in 1 vol. (plus another, incomplete: see below), 18th-century mottled calf, spine gilt in compartments, red lettering piece ('Miscellaneous Tracts'), joints cracked, cords holding, Macclesfield copy with bookplate and blind stamp (on the title-page of the incomplete work bound first), good

Publication Details: Prague: G. Schyparz, 1650

Notes: A pair of decidedly rare dissertations, extensions to, and defences of, Marci's main work on optics Thaumantias: liber de arcu coelesti, 1648. Prior to Marci, the prevailing theory of colour assumed that light was modified by the action of a medium to produce color. Most theories were based upon the assumption that color was simply a modification of light varying between whiteness and blackness. Marci preceded Isaac Newton in his belief that Light is not changed into colors except by a certain refraction in a dense medium; and the divers species of colors are the products of refraction' (Rich...more

Bibliography: (Wellcome IV p. 51, erroneously calling for 'plates' in the first work: the copies of these 2 titles in the Wellcome Library are bound together; no locations in the US in WorldCat)

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Price: £3,500

Subject: Sciences

Published Date: 1650

Stock Number: 55324

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