PLATE XIII. 



Fio. 45. Ordinary fat cells of a 

 fat tract in the omeutum of a rat. 

 (Oc., 3; Obj., 7.) 



FIG. 42. Membrana nictitans of frog, treated with 

 chloride of. gold. a. Branched pigment cells. 6. 

 Uupigiuented portion of the body o the cell. 

 d. Unpigmented process, c. Nucleus of pigment 

 cell. e. Ordinary unpii^uented branched flattened 

 cell. p. .41. (Oc., 4; Obj., 10 ; immersion reduced to 

 about half.) 



FIG. 43- Surface of chronically inflamed me- 

 sentery of ape, pencilled and treated with silver. 

 Caualiculur system : Migratory cells are seen 

 upon the flat branched culls, which, on account 

 of their nuclei and size, are probably not to be re- 

 gf.r.Ud as colourless blood corpuscles. (Oc., 3; 

 Obj., 8. Tube not drawn out.) 



L 



FIG. 44. The same preparation, showing the branched cells of the canalicular system fill, 4 with fat globules. 

 (Oc.. 3; Obj., 8.) 



FIG. 41. Horizontal preparation of cornea of rabbit, treated first with lunar caustic, and afterwards placed 

 in 10 per cent, saline solution. <!roun.l-Mil.slaii.-o clear, while the canalicular system is marked out by a dark 

 granular precipitate. This appearance, and that shown in fig. 39. have the same relation to each other as the 

 positive to the negative of a photograph, p. 3& (Oc., 3; Obj., 7. Tube not drawn out.) 



