A P'OKEiGN Invasion of England 295 



is tenderest. But when it emerges later (in in the 

 open air as a fly, it lias to walk back aj^ain to the 

 outer world above the joint ; and this it could not 

 do if it had still to ^^o head downward. Yet there 

 seems no room for it to turn in. Somehow or 



NO. 6. — THK C-.RUB TURNINt; RoUNO INSIDE ITS OWN SKIN. 



other, in that restricted space, it must reverse its 

 position ; it must ^et itself head upward. How 

 is it to do so ? This difhculty early struck Mr. 

 Enock in his examination of the creature's life ; 

 and with characteristic patience he determined to 

 investigate it. His researches not only answered 



