J. S. MITCHELL 



Original magnification X 570. <^e«j- 1 mm water immersion objective. 



Rat received 23 daily doses each of lOmg of Synkavit, with lOOmg at 20 minutes before death. 

 The compound responsible for the yellow fluorescence appears to be 2-methyl-l : 4-naphthoquinone- 

 2 : 3-oxide. 



185 



