[Comparison of the effects of organic dusts on respiratory organs of rats using a morphometric method].

The contributors studied changes in the respiratory organs in rats induced by lucerne, maize, cotton, flax and flour dusts. The dusts were administered intratracheally by 10 mg dosages. Histological studies of the lung parenchyma were performed in 3 months, which revealed granuloma formations caused by the dusts.

[Improvement in the histochemical method of detecting open capillaries].

A modification of Pickworth's method for detection of open capillaries is described. The special feature of this method consists in freezing the organ in situ with liquid propane, cooled with liquid nitrogen, with the subsequent lyophilization of the preparation and its fixing in gazeous formaldehyde. The slides were stained strictly according to Pickworth.