By means of comparing the weight of the brain with the weight of the spinal cord the authors seek a way to appraise the intelligence of the individual. Authors' concept, on the one hand, unites the advantages of the other methods, on the other hand, it reduces their errors. Namely, the weight of the spinal cord stands in proportion to the bulk of the body of the individual, its surface and its functions, while the brain — with the exception of a small somatic part standing in constant correlation with the spinal cord — serves as the seat of the intellect. In different vertebrates the weight of the brain surpasses that of the spinal cord in different degrees. The weight of the brain in the frog is twice as high as that of its spinal cord, in the dog six times, in the cerkof monkey 14 times, in the orang‐utan 33 times, and in man 43 times. Pertinent detailed data are revealed by the table.
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Krompecher et al. (1966) studied this question.