230 NATURAL HISTORY. 
the necessary wound in the skin of the animal whose 
blood is to be sucked. 
394. The head of the insect is furnished with certain 
appendages called antennc, supposed to be organs of 
feeling, and perhaps of hearing also. They are various 
in form, and commonly very beautiful, especially when 
examined with the microscope. In Fig. 180 you have 
Fig. 180.—Variously-formed Antenne of Insects. 
a variety of them represented. There are other feelers 
called palpi, which are usually much smaller and shorter. 
The antennz probably act as feelers in regard to objects 
a little distance off, while the palpi do the same for sub- 
stances close by the mouth of the animal. 
395. The senses of Insects are all acute; and yet the 
organ of smell has never been discovered, and in most 
no organ of hearing can be found. The organs of vision 
are generally plain to be seen, and are often exceedingly 
prominent objects as we look at the insect. Very com- 
monly the eye is a multitude of small eyes. In the com- 
4 a ie 
ay ih f Cane "3 
Re Zeke: seuss disecas BAe ||) 
ceases ooamentttnc: 
a neces il 
Fig. 181.—Head and Eyes of the Bee, showing the Division into Facets. 
