Animal Cognition
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Psychological scale.

Psycogenesis (sic) of man.

 Products of intellectual development.

Products of emotional development.
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28 Anthropoid Apes and Dog. 15 months. Indefinite morality. Shame, remorse, deceitfulness, ludicrous.
27 Monkeys, Cat, and Elephant. 12 months. Use of tools. Revenge, rage.
26 Carnivora, Rodents, and Ruminants. 10 months. Understanding of mechanisms. Grief, hate, cruelty, benevolence.
25 Birds. 8 months. Recognition of pictures, understanding of words, dreaming Emulation, pride, resentment, esthetic loce of ornament, terror.
24 Hymenoptera. 5 months. Communication of ideas. Sympathy.
23 Reptiles and Cephalopods. 4 months. Recognition of persons.
22 Higher Crustacia. 14 weeks. Reason. Affection.
21 Fish and Batrachia. 12 weeks. Association by similarity. Jealousy, anger, play.
20 Insects and Spiders. 10 weeks. Recognition of offspring, secondary instincts Parental affection, social feelings, sexual selection, pugnacity, industry, curiosity.
19 Mollusca. 7 weeks. Association by contiguity sexual emotions without sexual selection.
18 Larvæ of Insects, Annelida. 3 weeks. Primary instincts. Surprise, fear.
17 Echinodermata. 1 week. Memory.
16 Birth. Pleasures and pains.
15 Cælenterata. Embryo. Nervous adjustments.
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12 Unknown animals, Partly nervous adjustments.
11 probably Cælenterata,
10 perhaps extinct.
9 (same)
8 Unicellular organisms. Non-nervous adjustments.
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4 Protoplasmic organisms. Ovum Protoplasmic movements.
3 and
2 Spermataron.