LABORATORY GUIDE IN PHYSIOLOGY. 



discharge in the unit of time. Attach a second 

 length of the 6 mm. tubing, taking care that the 

 tubing is approximately horizontal. Note the dis- 

 charge in a unit of time. What is your conclusion? 

 Why does the discharge decrease when the length 

 is increased? 



If R equals resistance and L length of tubing, 

 does the following expression represent the facts: 



(9) R ooL ? 



Is the relation of discharge to resistance direct or 

 reciprocal ? 



Verify the following formula: 



(10) Dx-L. 



We have already found the formula I) ooryh. 

 Verify the formula: 



(11) Doo^ 



) Pressure. Disjoin all tubes from the reservoir. 

 Join a T-tube to the nozzle in this position 1; join 

 a segment of large glass tubing to the perpendic- 

 ular arm of the T-tube and support it in an upright 

 position. 



(1) Fill the reservoir to the 36 cm. mark, allow 

 the water to escape from the distal end of the 

 T-tube during a unit of time, meantime main- 

 taining the height of the water in the reservoir. 

 Carefully note the height at which the water 

 stands in the upright tube the piezometer. 



(2) Repeat with water maintained at 64 cm. 

 height in the reservoir. 



(3) Join a length of large tubing to the distal 

 end of the T-tube; repeat the experiment using 

 only the 64 cm. height. 



(4) Join a T-tube with piezometer No. 2, to the 

 distal end of the segment of tubing just added 



