16 COMPLETE INSTRUCTION IN 



form, and at this age measure If inches in cir- 

 cumference. 



The head, which is almost circular, is covered 

 with a thin shell. On either side of the head are 

 four eyes, that stand out like little pearls. 



The mouth is in the center of the head, and 

 lies up and down, instead of across, as in most 

 other insects and animals. 



Near the eyes are two major feelers, which they 

 use on all objects with which they come in con- 

 tact. Nearer the mouth are two smaller feelers, 

 used for similar purposes. Then come the two 

 little holes called spinnerets, through which the 

 silk comes from the silk-tubes as*it passes up in 

 very fine fibers to the cocoon. 



The motion the worm makes with its head as 

 it spins the cocoon, twists the two fine filaments 

 into one as each double circle is laid on over and 

 over s^gain and again without any variation or 

 tangling, provided the worms have been properly 

 cared for and left undisturbed in a warm atmos- 

 phere during the time of spinning the cocoons. 



The use of a magnifier will show that the bodies 

 of worms in the fourth and fifth ages are covered 

 over with a kind of bristle resembling pig's bris- 

 tles, though not nearly so numerous as on the 

 swine. 



The silkworm has sixteen paws. The first 



