The Clonus 



hand, is puckered by knotty excrescences, 

 which change their shape considerably in the 

 act of crawling. When moving, with the 

 flexible fore-part of the body groping to find 

 its way, the grub consists of a series of waves 

 that follow one another in perfect order. 



Each wave starts from the hinder extrem- 

 ity and by swift degrees reaches the head. 

 Straightway a second wave follows in the 

 same direction, succeeded by a third, a fourth 

 and so on, indefinitely. Each of these waves, 

 proceeding from one end of the grub to the 

 other, is a step. So long as the wave con- 

 tinues, the fulcrum, that is, the orifice of 

 the intestine, remains in its place, at first a 

 little before and then a litle behind the move- 

 ment as a whole. Hence the source of the 

 sticky dew grazes first the tip of the abdo- 

 men and then the end of the back of the mov- 

 ing grub. In this way the tiny drop of gum 

 is deposited above and below. 



The glue has still to be distributed. This 

 is done by crawling. Between the puckers, 

 the cushions, which the locomotory wave 

 brings together and then separates, alter- 

 nately come into contact and open clefts into 

 which the sticky fluid gradually makes its way 

 317 



