HEtlllC' SYSTtM 





Figure 1. T 69. Bilateral Embryonal Nephroma. Lateral view of tumors ari.sing from the kidneys. Hypertrophy of th 



unaffected kidney tissue is evident. , . ,. „ ,„ ^u^^ ih<. nolvcvsfi 



Figure 2. T 273. Embryonal Nephroma. The tumor mass of the kidney is cut m cross section to show the poiycys 



and variable character of the neoplasm. ..„ ^ e n.^ «or.r.i9cm illustrated i 



Figure 3 and 4. T 69. Embryonal Nephroma. Sections prepared rom d.^erent areas «/ '''e. "^"P'^*.'" '""ectfve 

 In Figure 3 many 'pearls" of keratinizing epithelium are evident. Figure 4 shows a mixture of connective d 



Figure 1. 

 landular 

 Figure .S. 



glandular tissue. Magnification X 30, ^^.^ Note the distended sinusoids filled with immature ery 



throblastic cells. Only a small amount of extravascular tissue surrounds the Isolated clear spaces formerly occupied y 



T 131. Bone marrow of the femur in fowl leukosis. Note the 



"""tgur^rcate 6"22. 'Liver in fowl -eukosis. The sinusoids are filled with immature blood cells which tend to stagna. 

 and cause compression of the cords of liver cells. Magnification X 270. 



