4 8 2 



GENERAL BIOLOGY 



gregarious instincts, will (if not too full-fed) try to get to the 

 others. Observe in detail his methods. Let one person of 

 the group of observers be time keeper, and let the others 

 record impartially all the efforts of the chick. These efforts 

 will follow each other, sometimes in such quick succession 

 that some short-hand method will be required for recording 

 them. The following, as inclosed in parentheses after the 

 acts named, are suggested : walking about (w; repeat the 

 sign for each start with change of direction) : calling to mates 

 or peeping (p) : peering through crevices or holes in the sides 

 of the box (o) : flying against the sides of the compartment 

 ( \f mark, or checkmark of any sort quickly made) : after 

 return entering the passage, from points of record (i, 2 or 3 ; 



FIG. 269. Diagram of a simple box labyrinth, arranged for testing trial and 

 error in young chicks, s 55 s s s, the chicks at the start, one isolated from 

 the company. /, a plate of food. /, 2, 3, 4, points of record in the passageway. 



there will be no return from 4, where the mates are sighted) . 

 Mark the chicken that is to be the first subject of the 

 experiment in some way (or note its personal characteristics) 

 so that the same one may be taken again for repetition of the 

 trial. Record all its acts and the time it takes to find the 

 way to its mates. Return it to the starting point and 

 record again ; and repeat until it has learned the passage, and 

 is able to traverse it without much hesitation or delay, and 



