Mammalia,
lower orders of, 42;
their own mode of growing up, 64;
embryos of, 64; 97;
members of class differ, 157, 158; 200;
order of mentality, 203.
Mammals, 40, 43, 157;
embryo of, 171.
Mammoth, 97.
Marmosets, 161.
Marquesas, 103.
Marsupials, 104.
Mastodon, 97.
Mechanism, organic, 14; living, 110.
Melanesia, 103.
Mendel, Gregor, 145; his law, 146; 147, 148.