SEP 12 1962

College of Physicians & Surgeons of Columbia University | New York 32, N.Y.
DEPARTMENT OF BIOCHEMISTRY 630 West 168th Street

September 10, 1962

Dr. Joshua Lederberg

Department of Genetics

Stanford University Medical School
Palo Alto, California

Dear Josh:

With reference to our conversation in August about brain research,
I am sending you below the reference to the last paper on experimental
improvement of maze-learning ability in rats, by injecting growth hormone
before birth:

B. G. Clendinnen and J. T. Eayrs: The anatomical and physiological
effects of prenatally administered somatotrophin on cerebral development
in rats. J. Endocrin. (England), 22, 183 - 193 (1961).

The authors have used my method, originally described in Physiological
Zoology 15, 281 (1942).

| .
With best regards,

Sow.

Stephen Zamenhof

Stimulation of ceytical-cell proliferation by the growth hormone. II!. Experiments —
on albino rats. Physiological Zoology 15: 281.

‘~! J! Y YAM YZ