instances of intelligence of, [51-63];

ideas of causality in, [58-60];

appreciation of principles by, [60], [61];

sign-making by, [88-102];

understanding of words by, [123-127];

articulation by, [128-138], [152];

reasons why none have become intellectual rivals of man, [154-157];

self-consciousness in relation to, [175-178];

recognizing pictorial representations, [188], [189];

conditions to genesis of self-consciousness manifested by, [195-199];