Questo libro raccoglie le lettere scritte da Giovanni Camillo Maffei, un filosofo e medico italiano del diciottesimo secolo, che approfondisce numerosi temi tra cui la filosofia, la medicina e l'arte medica. Nel libro, si trovano anche riflessioni sulla voce umana e il canto, che mostrano l'ampio interesse di Maffei per le arti e interessi inter-disciplinari.

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