Fig. 7. Lymph node from runt sacrificed at one week of age following an intravenous 

 dose of 12 million homologous spleen cells at birth. Extensive cellular destruction is 

 apparent, with considerable amorphous material amongst the surviving cells. The 

 changes in this example arc more marked than usual at this age. (Haematoxylin and 



eosin. x 150.) 



