References/Notes/Attributions:
Source
The data was found in Statistics in Biology, Vol. 1, by C. I. Bliss (1967), New York: McGraw Hill.
The original article is Scott, C. and Chen, K. (1944) "Comparison of the action of 1-ethyl theobromine and caffeine in animals and man," Journal of Pharmacological Experimental Therapy, v. 82, pp 89-97.