Such collections are supplied by Mr. Mawe, No. 149, Strand, London. His terms, for collections containing from 100 to 200 specimens, are 5 guineas; from 200 to 300 specimens, 10 guineas; and from 300 to 400 specimens, 15 guineas. For collections containing from 350 to 400 specimens, more select, and comprising a better suite of precious stones, he charges from 20 to 30 guineas; and for larger collections, from 50 to 100 guineas. At the particular request of the author, Mr. Mawe has arranged a few collections of minerals, and numbered them in such manner as to correspond with, and illustrate the present volume. ──────────────────────────────────────────────────────────────────────── PRINCIPAL SPECIES. { Diamond. _Diamond_. { { Zircon. _Jargoon_. { { { _Oriental sapphire_. { Ruby. { _Oriental ruby_. { Scratch { { _Emery_. { glass. { { { Schorl. { _Topaz_. { { { _Emerald_. { { { Garnet. _Precious garnet_. { { { { _Crystal_. { { Quartz. { _Flint_. { I. EARTHY. { { { _Agate_. { { { _Opal_. { { { { { Clay. _Pure clay_. { { { Clay slate. _Roofing slate_. { { Will not { Mica. _Muscovy glass_. { { scratch { Soapstone. _Fuller’s earth_. { I. STONES { { glass. { { { { Talc. { _Talc_. { { { _Asbestos_. { { { { { _Limestone_. { { { Lime. { _Phosphat of lime_. { { { { _Fluor spar_. { { II. SALINE. { { _Alabaster_. { { { { Barytes. { { Strontian. { { { Alumine. _Alum_. { { { { Magnesia. _Epsom salt_. { { { II. SALTS. { Soda.