[PAGE 1]
(b)(

For your Inforration I am enctosing copy of a letter to Dr. ,R. 3ircher, of Sandoz, Incorporated, and copies of three tables explaining the results of our studies to date on tolerance and cross tolerance between psilocybin and LSD-25, as well as our plans for continuation of this work in the imrediate future.

Sincerely yours,

Fuibbr

Abraham Vikler, M.D. Acting Director

Awirn

Enclosures

17

Nadoa lartitata of Meatel Helt Addictioa Retearth Caater U. Pbe Healtà Setvice Hoepital Leziagtoa, Learacky

DEPARTMENT OF HEALTH, EDUCATION, AND WELFARE

25 January 1960