24 GENERAL ORISMOLOGY. 



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Besides the above terms, expressive of colour, several are used derived 

 from natural objects, or from those in daily use. 



HYALINE (hyalinus), expresses a transparent, colourless part. 



PELLUCID (pellucidus, diaphanus), a coloured but transparent part. 



OPAQUE (opacus), a clouded, not transparent part. 

 The brilliant or glittering colours are derived chiefly from metals or 

 other minerals, to which they are exclusively peculiar. 



OPALINE (opalinus, or opalissans), the prismatic reflection of the 

 opal. 



MARGARITACEOUS (marg'aritaeeus\ reflecting the prismatic colours 

 like mother of pearl. 



CRYSTALLINE (crystallinus), the pure transparency of crystal. 



AMETHYSTINE (amethystinus), the brilliant colour of the amethyst. 



SMARAGDINE (stnaragdinus), the brijliant green of the emerald. 



SILVERY (argenteus') , the metallic white of silver. 



GOLDEN (auratus, or inauratus), the metallic yellow of gold. 



AURICHALCEOUS (aurichalceous ), the metallic yellow of brass. 



CUPREOUS (cupreus), the metallic red of copper. 



./ENEOUS (ceneus), the green metallic colour of bronze. 



CHALYBEOUS (chalybeus), the metallic blue of case-hardened steel. 



PLUMBEOUS (plumbeus), the pale blue grey of lead. 



FERREOUS (ferreus), the metallic grey of polished iron. 



SPLENDENT (splendens) , any colour having a metallic splendour. 



38. 



There are also peculiar terms to express the painting of parts. 



SPOT (punctum), a small roundish dark spot upon a plain surface ; 

 these spots must be distinguished from impressed punctures, but the 

 latter are sometimes differently coloured from the rest of the surface. 



ATOMS (atomi), are points not proceeding from the colour of the 

 surface, but applied to the surface ; they must, however, be so large and 

 distinct that each can be clearly recognised. 



PUSTULE (pustuld), a point of larger circumference. 



MACULA (macula), is a tolerably large angular spot, of a dark colour, 

 upon a uniform surface. 



GUTTA (gulla), is a light spot upon a light ground, viz. white upon 

 yellow. 



