42 STIGMATA. 
Lucy, Then they both breathe and 
walk on these feet. Why are they called 
windpipes ? 
Mother, Because they answer the 
purpose of respiration, or breathing, as 
your windpipe does, and they are formed 
in the same manner. 
Lucy, Then, mamma, I suppose 
these breathing feet would be spoiled by 
dirt, only for the little hairs that grow 
round the edges. 
Mother, I give you credit, my love, 
for exerting your reason ; you are proba- 
bly quite right in this case. There are 
also other passages through which they 
breathe, and which are connected with 
the trachea ; these openings are called 
stigmatce *, and are generally marked by 
a bright spot, which sometimes looks 
like gold. 
Lucy, I see them quite golden and 
bright in this dark, hairy caterpillar, 
which I have in my box. Let me see ;, 
yes, there are nine on each side. 
* From stigma, a mark or band* 
