w for the sake of condensed and consecutive presentation, the most
important conditions from day to day are arranged in tabular form:

CONDITIONS OF EXPERIMENT FROM DAY To DAY FOR PROBLEM 2

Date Punishment Reward

May 17 ............. 20 sec. confinement ........ Food in right box for each
(Aid after 10 trials) trial

" 18 to 21 ........ 30 sec. confinement ........ Food (banana) in right box
for each trial

" 22 to June 2 .... Illness, no experiments

June 3 ............... 15 sec. confinement ........ Food (banana) in right box
for each trial

" 4 ............... 30 " " ............. Food (banana) in right box
for each trial

" 5-10 ............ 60 " " ............. Beet, carrot and loquat, in
addition to banana

" 11 .............. 10 to 30 sec. confinement .. Beet, carrot and loquat, in
addition to banana

" 12 to 15 ........ 60 sec. confinement ........ Beet, carrot and loquat, in
addition to banana

" 16 .............. 60 " " ............. Banana and sweet corn--former
preferred

" 17 (1st series). 60 sec. confinement ........ Food (banana, as in early
series)

" 17 (2nd series). No confinement in wrong box; Food only for correct first
but instead, return to choices
starting point by way of
alleys

" 18 to 22 ........ No confinement in wrong box; Food only for correct first
but instead, return to choices
starting point by way of
alleys

" 22 (2nd series). No punishment; allowed to Food for each trial
enter boxes until right
one was found
" 23 .............. Return to starting point.
After five wrong choices
of a given box the animal
was held for 60 secs.