LETTER FROM HARRIS ISBELL RE TESTING RESULTS OF C-5 AND C-9

Natioaal teatime of Mental Heads Addiction Research Center Public Health Service Hospital Lexington, Cs:stocky Ca5) 15 1 14))5 DEPARTMENT OF HEALTH, EDUCATION, AND WELFARE ' PUBLIC HEALTH SERVICE 17 March 1953 I have worked the dose of C-5 up to 100 mg./70 kg. of body weight without obtaining any appreciable subjective mental effects, or any objective changes in behavior. Cardiovascular effects of the degree seen with C-9 also have not been apparent...