12 THE EGG. 



of the body, and the head and following segments 

 of the creature are extended upward toward the 

 summit of the egg, the hinder end overlapping 

 the segments which fall in its way. 



All these changes may transpire within four 

 or five days, although they ordinarily take a 

 fortnight, occasionally a month ; and there are 

 species of butterflies which pass the winter in 

 the egg state. 



