244 



NATTTKAL HISTORY. 



Fig. 189. Silk of the Cecropia. 



the silk of the Cecro- 

 pia, which has been 

 carded and spun, and 

 woven into stockings 

 that wash like linen." 

 The silk can be very 

 readily reeled off 

 from the cocoons as 

 seen in Fig. 189. 



418. Some Insects 

 go through an im- 

 perfect metamorpho- 

 sis, as the Grasshop- 

 pers and the Locusts. 

 They are produced 

 from the eggs without wings, but have them formed 

 gradually while they are in a state of activity. 



Questions. What are the three changes which most Insects pass 

 through in their metamorphosis? Explain the terms larva, pupa, 

 and imago. What are the different names applied to larvae ? What 

 is said of the terms chrysalis and aurelia ? What is said of the con- 

 trast between the larva and imago states? What is said of the 

 growth of the larva ? What of the growth of the imago ? What of 

 the casting of the skin of the larva? What is said of the various 

 modes of passing the pupa state ? Describe the manner in which the 

 Silkworm makes its cocoon. Describe the mode of its exit. What 

 is said of the thread of which the cocoon is made ? What are the na- 

 tive countries of the Silkworm ? What is said of the silk manufac- 

 ture? When pupae are to be out doors all winter, what provision?! 

 are adopted to guard against the cold ? Describe the Cecropia Moth 

 Describe its caterpillar.. Describe the construction of its cocoon 

 What is said of its exit? What is said of the manufacture of silt 

 from the cocoons of this and other large Moths ? What \ said of 

 Grasshoppers and Locusts ? 



