104 THE PHYSIOLOGY OF REPRODUCTION 



cells are said to be often found in inflammatory areas, and are 

 described as occurring in the stroma tissue of tumours in asso- 

 ciation with plasma cells, and also in the peripheral circulation 

 in cases of lymphatic and myeloid leuca?mia. They are 

 especially numerous during the recuperation period of the 

 bitch's uterus, and it is suggested that they must in some 

 unknown way be functionally connected with that process. 



polym. 



- sir. 



FIG. 15. Section through portion of mucosa of dog during the recupera- 

 tion period. (From Marshall and Jolly.) 



bat., basophil cell ; cos., eosinophil cell ; mon., mononuclear leucocyte ; 

 polym., polymorphs ; str., stroma cell. 



(3) Large mononuclear leucocytes (hyaline corpuscles or macro- 

 cytes), containing blood-pigment which gives the Prussian-blue 

 reaction. Since pigment formation and ingestion by leucocytes 

 are of frequent occurrence in the bitch's uterus at about 

 this stage, it is probable that this is the fate of the great 

 majority of the extravasated red corpuscles. It is possible, 

 however, as suggested in the paper from which this account is 

 taken, that a relatively small proportion may make their way 



