Another authority, speaking of this bird’s habits in the mountain regions, says, “During summer and autumn the Gray-crowned Finch is common above timber line, where it breeds, ranging higher than the titlark and being usually found in the vicinity of snow fields and the frozen lakes near the summit of the range. It is rather shy in such localities, though exceedingly tame in winter. Its flight is in undulating lines, like the crossbills. The only note I have heard it utter is a kind of churr, like the call of the scarlet tanager. They stay above timber-line till the close of October or the middle of November. They are perpetually roving from place to place feeding upon the seeds of weeds and grasses and are never at rest for a moment at a time, constantly whirling about in close, dense masses, like so many longspurs.” [Illustration: GRAY-CROWNED LEUCOSTICTE. (Leucosticte tephrocotis). Life-size. FROM COL. CHI. ACAD. SCIENCES.] CORUNDUM AND SPINEL. CORUNDUM. The mineral species Corundum affords a number of gems known by different names. These differences arise from the fact that the stones were used as gems before their mineralogical identity was discovered. Thus red Corundum is known as the ruby and blue Corundum as the sapphire. When Corundum suitable for gem purposes occurs of other colors, such as green, yellow or violet, the gems are sometimes known as green, yellow or violet sapphires, respectively, or by the name of another gem which they closely resemble in color, with the adjective Oriental prefixed. Such are the gems known as Oriental topaz, Oriental emerald, Oriental aquamarine, Oriental hyacinth, Oriental amethyst and Oriental chrysolite. Colorless Corundum is known as leucosapphire. While Corundum of all colors is used for gems, it is only that which is transparent which can be so employed. This is sometimes called noble Corundum to distinguish it from common Corundum. The two, however, often occur together. Common Corundum is used as an abrasive, emery being one of its varieties, but it has no gem value.