Passively functioning parts, [30] et seq., [64].
Personal selection, [30], [41], [42], [45], [52], [64]-[86], [80].
Phyletic variation, [31]-[32] footnote.
Phylogenesis, [8].
Phylogenetic variations, [31]-[32], [73].
Plasomes, [40].
Plus and minus variations, [35], [42], [46], [50], [79]-[80].
Polymorphism, [58].
Poulton, [64] footnote.
Predestined variation, [4].