ACTINO-MYCOSIS. 



441 



scraping with the fore feet, and occasionally well-marked 

 colicky symptoms. 



In the majority of cases the spleen becomes enormously 

 enlarged, being 70, 80, or 100 lbs. in weight; in one case over 

 200 lbs. When of such enormous size, there will be enlarge- 

 ment of the abdomen, and a possibility of diagnosing by external 

 manipulation and examination per rectum. 



Microscopically examined, these tumours are found to consist 

 of a reticular stroma, made up partly of anastomosing ramifying 

 cells, containing a multitude of round cells in its meshes, as 

 in figure 89. 



If a thin fresh section of a tumour is shaken with water so 

 that the lymphoid cells are washed out, the structure can be 





-^-t. 



.JJ0' 



Tig. 



-Mass of cells in meslies 

 of reticulum. 



Tig. 90.— Thin section from which 

 many of the cells have been washed and 

 pencilled out. 



more easily made out under the microscope, and the appearance 

 presented in fig. 90 will be seen. 



ACTINO-MYCOSIS. 



This malignant growth may be classified as a parasitic tumour, 

 consisting of the development of cellular sarcomatous elements 

 from an frritation caused by the presence of a vegetable parasite 

 —the actinomyces or ray fungus— a radiating or star-like vege- 

 table parasitic growth, as shown in fig. 91. 



The botanical position of this fungus is not yet determined. 



