1914.] NATURAL SCIENCES OF PHILADELPHIA. 303 



4. Major workers of Camponotus. 



Oil of peppermint: 



vibrated antennse. 



6 vibrated antennae and moved away. 



3 vibrated antennse and moved backward. 



3 moved antennse and moved away. 



3 arose quickly. 



2 arose and worked antennse. 



1 raised antennse. 



1 arose slowly. 



Reaction time 2-3 seconds, average 2.12 seconds. 



Oil of thyme : 



10 vibrated antennse. 

 6 arose quickly. 



4 moved away quickly. 



2 moved antennse and moved away. 



2 raised antennse. 



1 arose quickly and vibrated antennse. 



Reaction time 2-3 seconds, average 2.40 seconds. 



Oil of wintergreen : 



8 moved away quickly. 

 6 vibrated antennse. 



3 arose quickly. 



2 moved antennse. 



2 jumped backward quickly. 



2 arose slowly. 



1 moved antennse. 



1 tried to get through bottom. 



Reaction time 2-4 seconds, average 2.44 seconds. 



Honey and comb: 



11 moved antennse. 

 10 vibrated antennse. 



3 moved away slowly. 



1 tried to get through bottom. 



Reaction time 3-10 seconds, average 5.56 seconds. 



Leaves and stems of pennyroyal : 



12 moved antennse. 



9 vibrated antennse. 



2 raised antennse. 



2 moved antennse and moved away. 



Reaction time 2-5 seconds, average 3.40 seconds. 



