The red notebook of Charles Darwin / edited, with an introduction and notes by Sandra Herbert.

  • Charles Darwin
Date:
1980
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Licence: Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)

Credit: The red notebook of Charles Darwin / edited, with an introduction and notes by Sandra Herbert. Source: Wellcome Collection.

    90/184 (page 76)
    76 SANDRA HERBERT [172e;] D. remarks, bad conductor of Heat do of Electricity Does not iron, combined with nickel & cobalt (meteoric) resist oxidation? — Mem Sir W. P. stone^^^ It is clear to me, there are laws of solution & deposition under great pressure. ( ? fact!) unknown to us. M. Chladni. — on meteoric Mexican stone. Journal des Mines 1809. No. 151. p. 79.220 | [misnumbering, no page 173] 174e Under name of Sagitta Triptera D'Orbigny has figured animal with set2e like my undescribedQ] p. 140. Flèche of Quoy et Gaimard. — D'Orbigny has described it with care to 3 species. I think I have much additional informationell | 175e [continued from page 171] Guanaxuato, which has yielded the most metal, where the direction of ravins, and the slope of the mountains (flaqueza del Cerro) have been parallel to the direction & inclination of the vein. —222 at Zacatecas the veta grande has same direction as Guanax. — the other E & W. — veins richest not in ravins or along gentle slopes, but on the most elevated summits, where mountains most torn. — (Santiclinal line.^). —223 Mines of Catorce f(Principal veins)J 25° to 30° to NE. vein of Moran 84° NE. of Real del Monte 85° to S. // Tasco 40° to NW (afterwards said to be /fall with some exception^ directed NW & SE).224 I 176e r^ol IIIJ Mexican Cordillera immense variety of Porphyries which are destitute of quartz, & wh abound both in hornblend & vitreous felspar. — p. 215 225 Same metal in Tasco vein in Mica Slate & overlying Lime¬ stone 226 Balls of Silver ore occur in do veins.227 At Huantajaia. Humboldt says, mur of Silv.[,] Sulph. of do.[,]galena[,]quartz, Carb. of Lime, accompany. — Ulloa has said silver in the highest & gold in the lowest. Humboldt states that some of the richest gold mines on