NO. 2 RECOGNITION AMONG INSECTS McINDOO 2"/ 



To ascertain if workers from inside a hive would peacefully accept 

 pollen carriers entering their hive, 20 workers from a frame of 

 hive No. 7 were put into each of the observation cases. A pollen 

 carrier about to enter the same hive was put into each case. This 

 set of experiments was repeated with bees from hive No. jt^. Of 

 the 20 pollen carriers tested, 16 were accepted peacefully and four 

 were attacked very lightly. 



Twenty guards from hive No. 44 were put into each of three 

 observation cases, then a pollen carrier about to enter the same hive 

 was introduced into each case. One pollen carrier was attacked very 

 lightly and two were attacked lightly. 



Twenty pollen carriers about to enter hive No. 7 were put into 

 each of five observation cases, then a guard from the same hive was 

 introduced into each case. The pollen carriers showed no signs of 

 hostility toward one guard ; two were attacked very lightly ; one was 

 attacked quite forcibly ; and one was killed. A few minutes later 

 a guard from hive No. 29 was put into each case ; four of the guards 

 were attacked quite forcibly, and one was killed. While catching these 

 pollen carriers the writer saw the guards on the ahghting board attack 

 and carry away a pollen carrier, and when the pollen carriers were 

 put into the cases, three instances of fighting were seen among them. 

 This hostility indicates that the attacked pollen carriers probably 

 belonged to other hives, while the slight hostility of the workers 

 used in the other experiments toward the pollen carriers seems to 

 indicate one of two conditions as follows : ( i ) The workers and 

 pollen carriers were probably hive mates, but the hive odor carried 

 by the latter might have sufficiently disappeared in the field to cause 

 the pollen carriers to be received with slight hostility, and (2) the 

 workers and pollen carriers probably were not hive mates, but the 

 hive odor carried by the latter might have so nearly disappeared that 

 the workers could not distinguish them as strange bees. 



It was planned to carry on similar experiments by using nectar 

 carriers, but this was dropped for lack of time. In practical bee 

 keeping we know that nectar carriers often enter strange hives with- 

 out being molested, showing that the nectar they carry makes them 

 immune to attacks, or that the hive odor carried by them has suffi- 

 ciently disappeared to allow a peaceful reception. 



12. EFFECT OF ODOR FROM BEE STINGS 



To determine whether the odor from the stings of workers increases 

 the hostility exhibited when strange workers are put together, 2C 



