. Bulletins de l'Académie royale des sciences, des lettres et des beaux-arts de Belgique. Learned institutions and societies; Science. l'Acad,. Diabase de Challes. 4^ 1 AiigLte. altère. 4Epidote. 5. Quartz Liai. G. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Académie royale des sciences, des lettres et des beaux-arts de Belgique. Bruxelles

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