PLATE XVIII. 



2 V 



Capillary circulation in a portion of the web of a Frog's foot. 

 FIG. 138. FIG. 139 



Alterations in form in blood-discs : 1, Stellate or mul- 

 berry form ; 2, On warm stage ; 3, Amoeboid white-cell 

 forms. 



FIG. 140. 



Blood-discs : 1, Eliptic Discs of Amphibia ; 

 2, Human red-corpuscles; 3,White or lymph- 

 corpuscle ; 4, Rouleaux of red-discs. 



FIG. 141. 



Pus-corpuscles : a, with acetic acid. 

 FIG. 142. 



Mucous corpuscles and epithelium. 



Varieties of Epithelium : a, Tessalated ; b, Squamous; 

 c, Glandular; d, Columnar; e. Ciliated. 



