A FOREIGN INVASION OF ENGLAND 295 



is tenderest. But when it emerges later on in the 

 open air as a fly, it has to walk back again to the 

 outer world above the joint ; and this it could not 

 do if it had still to go head downward. Yet there 

 seems no room for it to turn in. Somehow or 



NO. 6. THE GRUB TURNING ROUND INSIDE ITS OWN SKIN. 



other, in that restricted space, it must reverse its 

 position ; it must get itself head upward. How 

 is it to do so ? This difficulty 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 



