CHICKS HATCHED FROM ALCOHOLIZED EGGS 133 



wires crossing the floor of the path were electrically charged 

 so that the chick choosing that path received a slight shock 

 and did not get out of the apparatus until it had gone back 

 and found the other exit. The light screens were placed alter- 

 nately in the left and right hand alley. 



The chick to be tested was placed in the release box at the 

 back of the apparatus and the wire screen which led to the 

 paths was not lifted until the chick crowded against or pecked 

 at it. No chick was ever left struggling in the release box. 

 The chick was always allowed to find its way in time into the 

 correct alley and out of the apparatus but its record for the 

 trial depended on its first Choice of exit paths. Each chick 

 was given ten preference trials with both exits open and the 

 wires not charged. The one chick which showed a preference 

 was not used in these experiments. Chicks of the third hatch- 

 ing were used with this apparatus. 



Six normal and five alcohol chicks were each given three 

 trials a day for twenty -five days. Immediately after this normal 

 No. 5 and alcohol No. 24 and six days later normal No. 13 and 

 alcohol No. 33 were given thirty additional trials in succession. 

 The records for the last fifteen trials at the end of the first 

 seventy-five trials are as follows: one normal chick made 73^% 

 correct choices; two made 60% correct choices; one made 46|% 

 correct choices; one made 40% correct choices; one alcohol 

 chick (No. 24) made 80% correct choices; two made 46f% 

 correct choices; one made 33^% correct choices, and one made 

 26f% correct choices. The records for the last ten of the thirty 

 additional trials given four of the chicks are as follows: normal 

 No. 5 made 100% correct choices; normal No. 13 made 90% 

 correct choices; alcohol No. 24 made 60% correct choices; and 

 alcohol No. 33 made 40% correct choices. 



Chicks of the fourth hatching were also used in this appa- 

 ratus. These chicks were trained in pairs, each pair being com- 

 posed of a normal and an alcohol chick. One normal chick 

 was given a trial. Then an alcohol chick was given a trial. 

 Then the normal chick was retested and the alcohol chick re- 

 tested and so on. This procedure was continued until one of 

 the chicks had made ten consecutive correct choices. Tests with 

 that pair were then discontinued and tests with a new pair begun. 



Normal No. 14 and alcohol No. 31 were each given 101 trials. 



