PLATE 1 



EXPLANATION OF FIGURES 



1 Experiment K28. Twenty minutes following injection. High-power view 

 of the cortex, showing the granular intracellular distribution of the Prussian 

 blue under the brush border of the cells of the convoluted tubules. Note also 

 the entire absence of iron in the glomerular capsule. 



2 Experiment K36. One hundred and sixteen hours following injection. 

 Low-power view of the cortex showing the patchy distribution of iron in certain 

 convoluted tubules, typical of the retained iron. 



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