LITERATQRE  .—The following

list includes the principal writers on dialling whose works have come down• to us, and. to these we must refer for descriptions of z the various constructions, some simple and direct, others fanciful and intricate, which have been at different times employed: Ptolemy, Analemma, restored by Commandine; Vitruvius, Architecture ; Sebastian Munster, Horologiographia; Orontius Fineus, De horo- logiis solaribus; Mutio Oddi da Urbino, Horologi solari; Dryander, De horo- logiorum compositione ; Conrad Gesner, Pandectae; Andreas Schoner, Gnomo- nicde; F . Commandine, FIG, io . Horologiorum descriptio; Joan . Bapt . Benedictus, De gnomonum usu; Georgius Schomberg, Exegesis fundamentorum gnomonicorum; Joan . Solomon de Cans, Horologes solaires; Joan . Bapt . Trolta, Praxis horologiorum; Desargues, Mani-ere universelle pour poser l'essieu, &c.; Ath . Kircher, Ars magna lucis et Umbrae; Hanlon, Explicatio horologii in horto regio Loneini; Joan . Mark, Tractatus horologiorum; Clavius, Gnomonices de horologiis . Also among more modern writers, Deschales, Ozanam, Schottus, Wolfius, Picard, Lahire, Walper; in German, Paterson, Michael, Muller; in English, Foster, Wells, Collins, Leadbetter, Jones, Leybourn, Emerson and Ferguson . See also Hans Loschner, Aber Sonnenuhren (2nd ed., Graz,'1906) .

(H .