File:Wislocki1920 plate 2.jpg

Plate 2

Fig. 6. Precipitation of Prussian blue in the omphalo-mesenteric vessels by immersion of the fetal membranes in acid formalin 30 minutes after the injection of 1 per cent potassium ferrocyanide and iron ammonium citrate into the amniotic cavity, demonstrating the escape of solutions from the amniotic sac into the fetal circulation.

Fig. 7. Kidney of guinea-pig fetus measuring 36 mm., showing trypan-blue in the convoluted tubules 72 hours after the injection of the dye into the amniotic cavity. Notice that the glomeruli are unstained.

Fig. 8. Section of the umbilical cord of a guinea-pig fetus measuring 42 mm., showing vitally stained mucoid connective-tissue cells, 24 hours after injection of trypan-blue into amniotic cavity. V., lumen of umbilical vein.

Fig. 9. Section of amniotic membrane of guinea-pig fetus measuring 41 mm., showing absorption of trypan-blue, 24 hours after injection of the dye into the amniotic cavity.

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