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I am enclosing herevith two' copies of a report "Further Attempts to Block ths LSD Reaction by Pretroatment with BOL."

You will note that we did finally attain significant blockade in these patients by pretreatment with 1 mg. of BOL three times daily for five days. I see no great. practical significance in this fact, but it may have important theoretical implications.

I will arrive in Washineton via C. & C. Railway about 0:45 a.m. on February Sth. I am looking forward to seeing you that day.

Very sincerely yours,

Harridved

H1:tkh

Harris Isbell, M.D. Director

Enclosures

Department of HEALTH, EDUCATION, AND WELFARE • Public Health Service

IN AEPLYING ADDRESS THE NATIDAL SKT OF MNTAL HLT ADDECTTON RESEAACH CINTER U.S. PULIC EALTH SERYIC HOSTAL F.0. 80x 2000 LOOR, NETUCKY

NATIONAL INSTITUTES OF HEALTH

27 January 1958

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