During the experiments on 40 rats of Vistar line with the help of general histology methods of investigation it was estimated that chronic intragastral introducing of ammonium paratungstate in doses of 50 mg/kg during two months caused moderately marked dystrophic and dyscirculatory changes in the inner organs of animals.
Markedness of toxic effect prevailed in the liver and kidneys. In kidneys there were marked: dilatation of urine area, stagnation plethora of glomeruli, hyaline dripping and hydropic dystrophy of tubules epithelia primarily in proximal divisions.