When the time exceeded 15 minutes the mice were helped out by the experimenter; a record of 15 minutes, therefore, indicates failure. Naturally enough the motives for escape were not sufficiently strong or constant to bring about the most rapid learning of which the dancer is capable. Sometimes they would remain in the wooden box washing themselves for several minutes before attempting to find a way of escape. On this account I made it a rule to begin the time record with the appearance of active running about. The daily average time of escape as indicated in the table does not decrease regularly and rapidly. On the fourth day, which was the first on which all three of the dancers returned to the cage by way of the ladder of their own initiative in both tests, the average is 214 seconds. In contrast with this, on the twentieth day the time was only 5 seconds. It is quite evident that the dancers had learned to climb the ladder. At the end of the twentieth day the experiment was discontinued with Nos. 2 and 6, and after two weeks they were given memory tests, which showed that they remembered perfectly the ladder-climbing act, for when placed in the wooden box, with Nos. 4 and 5 as controls, they returned to the cage by way of the ladder immediately and directly. TABLE 35 LADDER CLIMBING TEST Time in Minutes and Seconds No. of Date No. 1000 No. 2 No. 6 Average Daily Av. Exp. 1905 For All For All 1 Nov. 14 15' 15' 15' -- -- 2 15' 15' 15' -- -- 3 15 15' 15' 15' -- -- 4 300" 15' 15' -- -- 5 16 480" 15' 15' -- -- 6 180" 300" 420" 300" 300" 7 17 450" 240" 540" 410" 8 20" 15" 18" 18" 214" 9 18 90" 180" 135" 135" 10 135" 105" 165" 135" 135" 11 19 480" 240" 330" 350" 12 30" 120" 90" 80" 143" 13 20 360" 75" 120" 185" 14 5" 6" 8" 6" 95" 15 21 105" 450" 120" 192" 16 8" 80" 20" 54" 123" 17 22 255" 300" 180" 245" 18 10" 30" 270" 103" 174" 19 23 300" 660" 450" 470" 20 90" 120" 150" 120" 295" 21 24 240" 125" 225" 197" 22 4" 6" 168" 59" 128" 23 Nov. 25 305" 85" 130" 173" 24 5" 6" 118" 43" 108"