Notochord, [74], [79]

Ontogenesis, [26]

Phylogenesis, [26], [100], [310]

Placenta, [88]

Prayer, [259]

Primates, [91]

Productiveness and prospectiveness, [193], [200], [202]

Protoplasm, [32], [34]

Protozoa, [39]

Reflex action, [125], [135], [146]