Blood, [32], [43]-44;

growth of, [50]-51;

and air, [242] and following;

waste matter in, [253] and following;

poisons in, [263] and following;

living creatures in, [268] and following;

as defence, [279] and following;

messages by way of, [294] and following;

salt in, [329] and following;

sea water as, [330] and following.