PLATE XVI. 



FIG. 51. Preparation of suiface of omentum o rabbit, pencilled and treated with silver, a. The flat 

 branched cells of the cannlicular system are visible as finely granular stnu-tuivs ; their nuclei are sharply 

 defined, and in scxeral places are seen in the aet of dividing. 6. Migratory cells, some of which are 

 free, while others grow out from the flat cells of the canalicular system, like buds; in one of the latter, the 

 fonnatiou of a vacuole ia seen at c. d. A vacuole cell, the wall of which is already changed into endothelial 

 elemeuts. (Oc., 3; Obj., 9, Immersion.) 



