Milk, value of, as food, [110].
Monkeys, little use to man, [250].
value for inquiry, [250].
Mule, [95].
limitations in use of, [95].
only hybrid serviceable to man, [96].
mental qualities of, [98].
Musk ox, [241].
Organic hosts, [253].
Ostrich, [168].
possible improvement of, [168].
Pack animals, [104].
Parks, national, etc., [256].
Pea-fowl, [162].
habits of, [163].
intelligence of, [164].
Pets, influence of, [223].