" 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. in one of the boxes and was then released by way of the exit door and rewarded when the right one was chosen " 23 (2nd series). No punishment .............. Reward for each trial " 24 (1st series). Return to starting point. .. Food only for correct first choices " 24 (2nd series). No punishment .............. Reward for each trial " 25-30 ........... Same as on 24th ............ July 1 (1st series). No punishment .............. " " " " " 1 (2nd series). Return to starting point ... Reward only for correct first choices " 2-8 ............. Same as on July 1 .......... " 8 (2nd series). No punishment .............. Reward for each trial " 8 (3rd series). Return to starting point ... Reward only for correct first choices " 9-10 ............ Same as for July 8 (3rd series) " 10 (2nd series). Momentary confinement in ..... Reward for each correct choice wrong boxes " 12 .............. Return to starting point ..... Reward for correct first choice " 12 (2nd series). 30 sec. confinement .......... Reward for each correct choice " 12 (3rd series). 5 " " ............... " " " " " " 13 .............. 30 " " ............... " " " " " " 14-17 ........... Return to starting point ..... Reward for correct first choices " 17 (2nd series). 60 sec. confinement .......... Reward for each correct choice " 19 .............. 30 " " ............... " " " " " " 20-26 ........... 10 " " ............... " " " " " " 27-30 ........... Right box indicated by slight Reward in each right box raising of exit door momentarily. No punishment " 30 (2nd series). Return to starting point ..... Reward for correct first choices " 31 .............. " " " " ..... " " " " " " 31 (2nd series) to Aug. 10 .... 10 to 60 sec. confinement .... Reward for each correct choice Aug. 10 (2nd series). Threatened with whip ......... " " " " " " 11 (1st series). " " " ........... " " " " "