Refering to the knowledge about the metabolic pathway of melanine, certain reports about the role of SH-groups in the biosynthesis of rhodopsine, sense of taste, and olfactory response in animals, and to few facts which suggest the relationship between the darkness of skin color and sensation, the author speculate that there must be some relationship between the skin color and the sensorium in human being.
In this paper, the results is summarized about the observations in the relationship among the darkness of skin color, sense of taste, olfactory response, and the certain components of serum in 500 human adult cases.
1) About the sense of taste against P. T. C., NaCl and saccharine, female was more sensitive than male, and distinct correlations among the threshold value against 3 substances were observed. 2) There were no difference observed between male and female about the threshold of olfactory response against acetone and that against skatole, and between two values, distinct correlation was observed. 3) Between the cases who lived in urban district and rural district, there was no difference about the values above mentioned. 4) There were no correlation observed among the threshold ol sensorium, darkness of skin color, socalled vitamin C cutane resction, copper contents of serum, and iron contents of serum.
