174 Education through Nature 



in structure. The silky material (a fluid before forced out, 

 becoming thread-like upon exposure to air) is formed in 

 the silk glands, tubes lying on the underside of the body, and 

 opening into the under lip by a common duct, the little 



Imago. 



FIG. 12. 



projection out of which the silk comes being called the 

 spinneret. These facts concerning the silk glands are 

 from statements made by authorities upon the subject of 



