XXII. The laws of blood pressure determined from 

 an artificial circulatory system. 



/. Appliances. Two large Y tubes of about 6 mm. lumen ; 

 four medium Y tubes, lumen about 4 mm ; eight small 

 Y tubes, lumen about 2 mm. ; six thick walled capillary 

 tubes, about 3 mm. outside measurement, and lumen not 

 to exceed 1 mm. These capillary tubes should be about 

 15 cm. long. Two T-tubes of medium lumen; two 



FIG. 17. 



medium sized glass tubes about 75 cm. long. All 

 rubber tubing should be thin walled and very elastic, 

 and should be in three sizes, corresponding to the glass 

 tubes. Two pieces of large size, 75 cm. long, and two 

 pieces about half that length ; four pieces of medium 

 size, about 40 cm. long ; ten pieces of small size ; bulb; 

 heavy linen thread; mercury; large glass receptacle for 

 water, two medium sized rubber couplings. 



102 



