_Lines_ (_Surfaces_): Silex, Burnt-sienna. Sal, Yellow-ochre. Portica, Dun. Crux, Indian-red. Pagina, Yellow. Pactum, Yellow-green. Orca, Dark-grey. Camoena, Deep-crimson. Moena, Dark-blue. Proes, Blue-green. Murex, Light-yellow. Alvus, Vermilion. _Surfaces_ (_Solids_): Pluvium, Dark-stone. Idus, Oak. Tela, Salmon. Vesper, Pale-green. Mala, Light-buff. Margo, Sage-green. [Illustration: MODEL 11. SECTION BETWEEN VESPER AND IDUS.] COLOURS: INTERIOR OR TESSARACT, WOOD. _Points_ (_Lines_): Luca, Leaf-green. Cuspis, Orange. Cadus, Green-grey. Mensura, Dark-purple. Tholus, Brown-green. Callis, Reddish. Semita, Leaden. Livor, Pale-yellow. _Lines_ (_Surfaces_): Lotus, Azure. Syce, Black. Lorica, Sea-blue. Lappa, Bright-green. Silex, Burnt-sienna. Moena, Dark-blue. Murex, Light-yellow. Portica, Dun. Limbus, Ochre. Mel, White. Mango, Deep-green. Lares, Light-grey. _Surfaces_ (_Solids_): Pluvium, Dark-stone. Mala, Light-buff. Tela, Salmon. Margo, Sage-green. Velum, Chocolate. Lar, Brick-red. [Illustration: MODEL 12. SECTION BETWEEN PLUVIUM AND TELA.] COLOURS: INTERIOR OR TESSARACT, WOOD. _Points_ (_Lines_): Opex, Purple-brown. Mappa, Dull-green. Bolus, Crimson. Dos, Blue. Lensa, Dark. Calor, Dark-green. Iter, Bright-blue. Via, Deep-yellow. _Lines_ (_Surfaces_): Lappa, Bright-green. Olla, Rose. Syce, Black. Lua, Bright-brown. Crux, Indian-red. Sal, Yellow-ochre. Proes, Blue-green. Alvus, Vermilion. Lares, Light-grey. Meatus, Deep-brown. Mel, White. Croeta, Light-red. _Surfaces_ (_Solids_): Margo, Sage-green. Idus, Oak. Mala, Light-buff. Vesper, Pale-green. Velum, Chocolate. Lar, Brick-red. Transcriber’s Notes Lay-out and formatting have been optimised for browser html (available at www.gutenberg.org); some versions and narrow windows may not display all elements of the book as intended, depending on the hard- and software used and their settings. For this text file, several diagrams and tables have been split or otherwise re-arranged in order to fit the available width. Wherever possible, these splits and re-arrangements have been done so that the meaning of the lay-out has been retained. The contents of Tables A through D have been replaced with place holders; their meanings are listed below the diagrams. Inconsistencies in spelling (Mœnas v. Moenas; Praeda v. Proeda), hyphenation (Deep-blue v. Deep blue, etc.) have been retained. Page 197, row starting Sophos: the last letter of Blue has been assumed. Changes made: Footnotes, tables, diagrams and illustrations have been moved outside text paragraphs. Indications for the location of illustrations (To face p. ...) have been removed; the illustrations concerned have been moved to where they are discussed. Some minor obvious typographical errors have been corrected silently. Page 42: ... the flat, being ... changed to ... the flat being ...