Lantern 
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q its do not Skee spurt, stic to illustrate 
her in oe but infinite ely highe eo 
wil ed 38 SAMPLES othe : Educational and 
Scientific Subjects 
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inElementa ry Education anon teat co saigeg 
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w 5 & EARLE, 
At all Booksellers, or order from Manufacturers of Stereopticons, Microscopes, etc., 
le 18 Chestnut St., Phila. 
The Halyersity of Chicago Press Dept. 24 9 ” 
hicago, Illinois 
° ee 
Ani} i i al igh EXPERIMENTAL 
TUDY ON THE 
PS y CHICAL 
DEVELOPMENT 
e 
OF THE WHITE RAT, 
| } CORRELATED WITH 
: THE GROWTH OF ITS 
N 
By JOHN B. WATSON, Pu.D. 
light upon the alowne questions: (1) ris it p ) vi ea systematic 
ee gradual anisldtne of the ssapciatint pr met in the r ) 
possible to find out whether or not medullated nerve fibers in the cort e rat are 
any connection between the increasing complexity of the psychical life and the 
a. of the medullated fibers in the cortex, together with their extension toward its 
surf 
122 pp., with numerous text- figures and plates, 
$1.25, net; postpaid, $1.35 
T ALL BOOKSELLERS, OR ORDER DIRECT F 
University of Chicago Press, Chicago, Tilinois 
