THE PHYSIOLOGY OF EXCRETION. 



95 



the food in the funnel cell body is carried into B, and recon- 

 structs with C-JJ^" the original ciliary substance C. The 

 waste product IV" is discharged and carried away into the 

 receptaculum. 



In the excretophore E we find the following given factors : 



J^ 



M {C — W). 







B 



+ 6 + IF'" 



Fig. 6. 



W= the excretory granules picked up by the cell during its 

 wandering, and A''= nutritious substances composed of plasma 

 P and the often-mentioned isolating drops/. The secretion or 

 waste product IV from the funnel cell body A influences the 

 excretophore £ so that the latter disintegrates. During this 

 process W reacts on JV, and as a result of this chemical process 

 we get iV' = fluid nutritious substances, which are possibly used 

 up by the surrounding tissues. O^iree oxygen, which is 



