 | Friedrich Mohs - Mineralogy - 1825 - 506 pages
...in the characters of these systematic unities. From their agreement with some, and their difference from other characters, we infer, that the individual...character of the species, it will in some instances be necessary, and in all cases advisable, for the sake of certainty (§. 246.), to have recourse to... | |
 | Friedrich Mohs - 1825 - 500 pages
...in the characters of these systematic unities. From their agreement with some, and their difference from other characters, we infer, that the individual...species. Having advanced in this manner to the character «f the species, it will in some instances be necessary, and in all cases advisable, for the sake of... | |
 | Ebenezer Emmons - Geology - 1832 - 320 pages
...From their agreement with some, and their difference from other characters, we infer that the mineral belongs to one of the classes, to one of the orders,...one of the genera, and to one of the species. Having in this manner advanced to the character of the species, it will generally be necessary to ascertain... | |
 | Robert Jameson - Mineralogy - 1837 - 328 pages
...try the streak upon a file, or, still better, upon a plate of biscuit porcelain, will be sufficient. Having advanced in this manner to the character of the species, it will, in some instances, be necessary, and in all cases advisable, for the eake of certainty, to have recourse to the dimensions... | |
 | John Joseph Griffin - Crystallography - 1841 - 538 pages
...in the characters of these systematic unities. From their agreement with some, and their difference from other characters, we infer, that the individual...character of the species, it will in some instances be necessary, and in all cases advisable, for the sake of certainty, to have recourse to the dimensions... | |
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... given individual is now carried through the subordinate characters of the classes, orders, genera, and species, one after the other, comparing its properties with the characteristic marks contained in the characters of these systematic unities. From... 