Müller, H., on colours of flowers, [259];

on nectaries, [307].

Multicellular organisms, division of labour in, [27].

Musca domestica, length of life of, [43].

Musca vomitoria, polar bodies of, [353].

Myopia, [89].

Nägeli, [167], [171], [175];

on idioplasm, [174], [182], [190], [201], [340], [414];

on inherent tendency to vary, [256], [298];

on Alpine plants, [269];