ANTENNA. 89 
how such a little thing can he divided 
into joints. 
Mother. In the larger species, the 
unassisted eye can see the joints plainly ; 
but in those that are very minute, a 
microscope, you know, can render the 
smallest part visible. 
Lucy. But why are not the antennae 
a sufficient mark for these divisions ? 
Mother, Because sometimes the same 
form is common to the antennse of two 
or three genera, which, in other pecu- 
liarities, are quite different from each 
other. 
Lucy. And also, I suppose, because 
there are only three kinds of antennae, and 
that there is a much greater number of ge- 
nera. 
Mother. That would be a good rea- 
son, if there were only three kinds of 
antennae ; but there are many others be- 
sides the three with which you are ac- 
quainted. 
Lucy. Mamma, I think, if you would 
be so good as to draw for me those 
