Illustrated Companion to the Latin Dictionary/Specularia

This article incorporates text from a publication now in the public domain: Rich, Anthony (1849). The illustrated companion to the Latin dictionary, and Greek lexicon. p. vi. OCLC 894670115. https://archive.org/details/illustratedcompa00rich. 

SPECULA'RIA. Window panes; made of thin plates of talc (lapis specularis); a transparent substance, which the ancients employed for the above purpose, before the invention of glass, both as a closing over the aperture of a window (Senec. Ep. 90. Ib. 86. Q. N. iv. 13.), and for covering conservatories, garden frames, &c. Plin. H. N. xix. 23. Columell. xi. 3. 52.