244 NATURAL HISTORY. 
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. 
Fig. 189.—Silk of the Cecropia. 
Questions—What are the three changes which most Insects pass 
through in their metamorphosis? Explain the terms larva, pupa, 
andimago. What are the different names applied to larve ? 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 manutac- 
ture? When pup are to be out doors all winter, what provisions 
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 silk 
from the cocoons of this and other large Moths? What is said of 
Grasshoppers and Locusts ? 
