Plate VI. Rat-kidney phosphatase by the method of Loveless and Danielli. 

 Figure A shows a section incubated with substrate and p-nitrophenylazo- 

 4-naphthol. This mixture contains no activator for brush-border phospha- 

 tase, so that only nuclear phosphatase is demonstrated. Figure B, same 

 as Fig. A, but incubation carried out with activators for both brush -border 



and nuclear phosphatases. 



*&• 



