188 N. E. McINDOO 
tus, in which capacity they inform the insects of the objects 
immediately in front of them. In case of the honey-bee, they 
might also be sensitive to the weak currents of air caused by 
workers fanning. It is possible that the sense hairs are not 
affected by these weak currents, and therefore some method is 
Fig. 13 Diagram, representing a block taken from terminal antennal seg- 
ment of worker honey-bee, showing tactile hairs (Thr), pegs (Pg), pit pegs (PP), 
Forel flasks (Fl), and pore plates (P) in both perspective and in section. a and 
c, light colored bands; b, dark band; d, inner groove; and m, double, hinge-like 
membrane of pore plate; St, nerve strand; SCG, sense cell group. 
badly needed to keep the bees constantly informed whether or 
not the fanners are working properly. If these interpretations are 
correct, we here have another form of touch. Of course these 
organs might also be sensitive to wave vibrations of a very low 
frequency, but if this interpretation is correct, we would yet 
