(Born: Llanwyddelan, Mont., Wales, 10 January 1847; Died: 16 April 1926) Welsh crystallographer & mineralogist.

In 1869, Lewis graduated from Oxford, becoming assistant in mineralogy at the British Museum. In 1881 he was appointed professor of mineralogy at Trinity College of Cambridge, a post he held until his death.

Biographical references: American Journal of Science: 111 (1926), xliv-xlviii. • Barr, Index to Biographical Fragments, 1973: 155. • BBA: I 685, 297-300; II 1615, 370-372. • Cleevely, World Palæontological Collections, 1983: 185. • Dictionary of Welsh Biography: 564 [by R.T. Jones]. • Mineralogical Magazine: 1926, 241-4. • Nature: 117 (1926), 628-9. • Poggendorff: 3, 805, 4, 879, 5, 740 & 6, ???. • Proceedings of the Royal Society of London: Series A, 111 (1926), xliv-xlviii. • WBI.

1. English, 1899.
A Treatise | On | Crystallography | By | W.J. Lewis, M.A. | Professor Of Mineralogy In The University Of Cambridge, Fellow Of Oriel College, Oxford. | Cambridge: | At The University Press. | 1899 | [All rights reserved.]

8°: [i]-xii, [1]-612 p., 553 text illus. Page size: 224 x 140 mm.

Contents: [i-ii], Half title page, " Cambridge Natural Science Manuals. | Geological Series. | Crystallography.," verso "London: C.J. Clay and Sons, ..."; [iii-iv], Title page, verso "Cambridge: | Printed By J. And C.F. Clay, | At the University Press."; [v]-viii, "Preface," signed W.J. Lewis, 28 September 1899.; [ix]-xii, "Contents."; 1-604, Text.; 605-612, "Index."

Very scarce. A highly esteemed work, that gives a clear lucid explanation of its subject. Treats crystals, their origins, law of interfacial angle constancy, symmetry, axes, zones, drawing of crystal diagrams, crystallographic projection, twins, crystallographic systems, etc.

Bibliographical references: Dana's 7th (Bibliography): 76.

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