Messina, [179], [180]

Messina, Straits of, [179]

Metallurgy, [356], [359], [360]

Metals, transmutation of, [257]

Meteoric iron, [80], [94]

Metz, [391]

Mexico, [74], [76], [324], [321], [384], [385], [389], [399]

Michael VII, Emperor, [268]

Michael VIII. (See Palæologus)

Microscope, [355]