抄録
1. Coprophagy by rabbits was studied by fitting them with collars which prevented coprophagy, and a special mucous feces covered with mucoprotein-substance was found to be excreted.
2. Complete separation of pink-colored mucous film was made from the mucous feces, and the film was proved to be chiefly composed of mucoprotein and vitamin B12.
3. From the above findings, the pink-colored mucous film obtainable from fresh mucous feces seems to be nothing but a kind of vitamin B12-mucoprotein-complex formed by the flora in the digestive tract, and the chemical nature is supposed to be quite similar to a kind of intrinsic factor.
