PLATE XXI. 



Tangential Sections. Natural Size 



I 



Fig. 17.,; 



and 



Fig. 173. 

 A ing the end- 

 [lie removal of th > 



Fig. 174 



Lophi:. ' k), show 



coarse prominent pores and ill 

 ; by the cutting of the 

 of soft-tissue. 



Ilffl 



splitii 



