HABIT-FORMATION IN A WASP (VESPA SP.). 283 



Learning of Wasp. 



(The times are f^iven in seconds, 

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her departure from the nest), in walking over and digging at the 

 plug, and in high-speed random flights along the face of the 

 clay to right and left for a distance of about 200 cm. each way. 

 At the last of these she passed closely across the entrance to the 

 rabbit-burrow, alighted, and walked in to the nest. In the 

 preceding random movements the Wasp passed the burrow at a 

 distance of about 30 cm., and gave no sign of a positive reaction 

 to the nest. In the random flights of succeeding trials, before 

 the new motor-habit was properly formed, she passed the burrow 

 at a similar distance without giving an obvious sign of reaction 

 to the nest, so that she reacted positively at a distance of 40 to 

 50 cm., but not at 70 cm., to a nest which was visible to the 

 human eye at a distance of at least 300 cm. 



As a result of the first experience, high-speed random flight, or 



