290 



l-i . \siu.u, ii is ON NATIKK 



walking steadily for four hours, at the end of 

 which time it has covered a record space of 

 nearly three inches, it arrives at the joint, wheie 

 the sheath begins, and so finds its way blocked by 

 the partition wall ; it can get no further. Here 



NO. 3. THE GRUB AT WORK. 



then the young grub stops, as you see in No. 3, 

 wedged tightly in between the leaf-sheath and the 

 stem, and with its head pointing downward. Being 

 a hungry, and therefore an industrious creature, 

 it at once sets to work to eat the barley-plant. 

 This it does by fixing its sucker-like mouth on the 



