Blein, M. LE BARON, a general officer in the French engineer corps, was born about 1767. He published in Paris, in 1827, an "Expose de quelques Principes nouveaux sur l'Acoustique et la Th�orie des Vibrations, etc." In 1828 he labored to reform the diatonic gamut, the mode of writing music, &c. Finally, he published, in 1832, "Principles of Melody and Harmony, deduced from the Theory of Vibrations," Paris, 8vo., with plates. His theories have been accused of fundamental errors.