1861, William Howitt,John Cassell's illustrated history of England:
Church music was carefully taught at the universities. IT was of the four sciences of thequadrium, and was a means of promotion in the church and colleges.
1997, Timothy J. Reiss,Knowledge, Discovery and Imagination in Early Modern Europe:
He describes how by the late fifteenth century the language arts of the trivium had come to seem useful only for communication, teaching and public debate, and how humanists turned to the mathematical arts of thequadrium - including music - to enable new means and methods of discovery.
2014, Andreas Nordin,Transnational Policy Flows in European Education:
The classical curriculum distinguishes between trivium andquadrium to classify knowledge fields in education. Trivium deals with the disciplines of language, grammar, rhetoric, dialectic and logic, whilequadrium deals with the sciences of arithmetic, geometry and astronomy.
2011, “Kinetic Isotope Effects for the Reactions of Muonic Helium and Muonium with H2”, inScience, volume331, number6016, page448:
The decimal character of 4.1 is a reminder that this is not a conventional H isotope such asquadrium,4H, or other isotopes up to7H, with lifetimes, when known in the 0.1 to 1 zs range.
2014, Robert Godes, “Controlled Electron Capture and the Path Toward Commercialization”, inJ. Condensed Matter Nucl. Sci., volume13:
The almost stationary ultra-cold neutron(s) occupies a position in the metal lattice where another dissolved hydrogen is most likely to tunnel in less than a nanosecond, forming a deuteron / triton /quadrium by capturing the cold neutron and releasing binding energy.
