112 



TEXT-BOOK OF ENTOMOLOGY 



hairs of the empodiu-m are others which must be supplied with a 

 nerve, forming tactile hairs, as they each proceed from a unicellular 



ganglion (Fig. 108, n"). The secretion is forced out of the gland by 

 the contraction of the protoplasm, Dewitz having seen the secretion 

 driven out from the internal vesicle into its neck. 



