With the use of linear scan technics, on aldehyde-fuchsin stained slides, islet volume and beta cell volumes were quantitated in pancreas of diabetic, subdiabetic and normal rats. Glycogen infiltration was assessed on PAS-stained slides. Subdiabetic and normal animals had been injected intraperitoneally with 40 per cent glucose (4.0 gm./ kg.) at hourly intervals for two and four hours; controls were injected with saline.

Progressive degranulation of beta cells was observed as the period of glucose injection was prolonged. Glycogen infiltration was inversely related to degranulation of beta cells; the cytologic results were related to blood sugar values obtained at hourly intervals.

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