240 MINUTE MARVELS OF NATURE 



tubes convero-ino- to the two laro-er ones, each tube 

 kept open by numerous horny half-rings, scarcely 

 visible on the photograph, constitute together 



Fig. l6i. Prol)OScis of a hover-Hy 



with other internal parts a marvellous mechanism 

 for facilitating the tlow of fluid substances by 

 capillary attraction towards the mouth. Durinir 

 the process, saliva is first secreted by the salivary 

 ducts and rubbed about until some of the food- 

 stuff is dissolved, after which it is sucked up again. 

 The two bristly club-shaped organs on each side 



