ORDER I. BRACHYTYPOUS LIME-HALOIDE. 99 



OBSERVATIONS. 



1. The correctness of the natural-historical determina* 

 tion of the present species is put beyond a doubt by the 

 properties which it presents, particularly those contained 

 in the character of the species. It has been for the first 

 time distinguished from others in the Characteristic of the 

 Natural History System, and more particularly from the va- 

 rieties of Rhomb-spar with which it was formerly con- 

 founded. It has since been noticed by several mineralo- 

 gists. Perhaps there are among the number of minerals, 

 at present called Dolomite, Rhomb-spar, Miemite, Gur* 

 hofian, Bitter-spar, Brown-spar, Pearl-spar, &c., still con- 

 tained the varieties of other species, like the following one, 

 of which this is evident from the measures of its angles, 

 specific gravity, hardness, and other characters. The es- 

 tablishment of macrotypous, brachy typous, and paratomous 

 Lime-haloide, as particular species (besides those which be- 

 long to the following order), Must therefore be consider- 

 ed only as a first attempt towards a more correct determi* 

 nation of these species, the continuation and developement 

 of which will not only spread more light upon the natural- 

 historical genus in general, but also more particularly upon 

 the chemical constitution of these species. 



2. The present species contains carbonate of iron, and 

 carbonate of magnesia. These two ingredients were found 

 in it by Professor STRO METER. According to Mr BROOKE, 

 they are to each other in the proportion of about 1-315 : 

 8-685 without a trace of lime. 



3. The varieties of this species have always been found 

 accompanying those called Rhomb-spar, of the preceding 

 one ; and tire varieties of both of them are often mixed with 

 each other, as is the case in the Rothen Kopf and Greiner 

 mountains in the Zillerthal. 



4. It occurs in various pkces in Salzburg, the Tyrol, 

 and Switzerland, and has lately been discovered in very si- 

 milar varieties, associated with the preceding species in 

 Unst, one of the Shetland isles. 



