216 ADVANCED LESSONS IN PRACTICAL PHYSIOLOGY 



pressure and the blood-pressure in the portal vein? Obviously, the bile- 

 pressure is determined in this case in mm. H 2 O. Divide by 13.5 in 

 order to obtain the corresponding value in mm. Hg. Since the portal 

 pressure in cats amounts to about 7 mm. Hg while the secretory press- 

 ure frequently rises to 15 mm. Hg, it may be concluded that the hepatic 

 cells are capable of secreting even against a pressure higher than that 

 under which they obtain their material. 



5. Experimental Jaundice. Inject into the bile-duct a saturated 

 solution of indigo-carmin, noting by a watch the time when the injec- 

 tion has been begun. Clamp the common duct. Watch for the blue 

 color to appear in the skin, the mucous membrane of the mouth, the 

 conjunctiva, and the chyle in the lacteals. Squeeze the urinary bladder 

 at intervals and expel a small quantity of urine. How soon after the 

 beginning of the injection does the urine assume a blue color? 



6. Thoracic Duct. Arrange for artificial respiration. Open the 

 chest and expose the thoracic duct on the left side of the spinal column. 

 It is now rendered clearly visible by the blue chyle. 



7. The Stomach Contents. Palpate the stomach. Has the food 

 been fully reduced mechanically? Evacuate its contents. Wash the 

 gastric mucosa and note its soft velvety texture. Examine preparations 

 of gastric glands under the low and high powers of a microscope. Iden- 

 tify the chief and parietal cells. 



