The material on which this report is based is derived from an experimental investigation which has been in progress for two years. The purpose and plan of the study, together with certain of the earlier detailed results, have been described elsewhere.1 The present article presents several trends which have become increasingly evident as the work has progressed and which seem, in the light of the accumulated evidence, to be beyond a possibility of being due to chance.
Emotional traits present far greater obstacles to adequate study and measurement than do the intellectual characteristics of a person. Tests of intelligence are now in wide use. In addition to their strictly clinical value as aids to diagnosis and prognosis, experimental work with psychometric tests has led to considerable insight into the nature of intelligence and the hereditary, developmental and environmental factors involved in it. Intelligence, however, is dealt with relatively easily
GILBERT J. RICH. BODY ACIDITY AS RELATED TO EMOTIONAL EXCITABILITY. Arch NeurPsych. 1928;20(3):589–594. doi:10.1001/archneurpsyc.1928.02210150149010