Chap, l] TISSUES AND MECHANISMS OF DIGESTION. 423 



whole process, namely the transference through the epithelium 

 cell from the inside of the canal to the lymph-space of the villus. 

 And we may perhaps be inclined still to regard the second step 

 the transference from the lymph-space to the blood stream as 

 more strictly an act of diffusion. But the considerations which 

 we urged (§ 236) in regard to translation from the blood vessel 

 to the lymph-space may also be applied to the reverse current ; 

 we may look upon this as something much much complex than, 

 and so different from, ordinary physical diffusion. 



