Structure of Antenne. 57 
Insects often find their mates when to us it would seem 
impossible. Thus I have known hundreds of male moths 
to enter a room by a small opening in a window, attracted 
by a female within the room. I have also known them 
to swarm outside a closed window lured by a female within. 
Male insects have even been known to reach their mates 
by entering a room through a stove-pipe. Yet Hauser 
found that this ability was gone with the loss of the 
antenne, Kraeplin and others have since proved the cor- 
rectness of Hauser’s conclusions. So that we now know 
Fic, 11. 
Microscopic Structure of Antenna, after Schiemenz. 
2 Nerves. 4 Tooth hairs, 
¢ Cells. Pp Pits or pori. 
that the antenna, in most insects at least, contain the organ: 
of smell. Histologically this apparatus is found to con. 
sist of nerves (Fig. 10, 2) which run from the brain tc 
the antennz and at the outer, sensitive end, contain a 
cell (Fig. 11) with one or more nuclei. These nerves 
may end in perforated, tooth-like hairs on the antenne 
(Fig. 11, 4) in pegs which have no chitinous sheath, 
which push out from the bottom of pits—pori, which exist 
often in great numbers in the antenne (Fig. 11). While 
Erichson first discovered the pits (Fig. 11, p) in the 
antenne, Burmeister discovered the sensitive nerve-ending 
