CIRCULA TION. 97 



and repeat the experiment. (Note: The 

 piezometers may be held in position by using 

 the two supports and the pine stick.) Does 

 the addition of the last T tube make any essen- 

 tial change in the height at which the water 

 stands in piezometer No. 1? Does the reading 

 of piezometer No. 2 agree with the reading of 

 piezometer No. 1 in experiment (2). 



(5) Add a second segment of large tubing. Re- 

 peat the experiment. Does reading of pie- 

 zometer No. 2 correspond with reading of pie- 

 zometer No. 1 in experiment (3)? 



(6) Add piezometer Np. 3. Repeat the experi-. 

 ment. Does reading of piezometer No. 3 cor- 

 respond with that of No. 2 in experiment (4) 

 and with No. 1 in experiment (2)? Does read- 

 ing of piezometer No. 2 correspond with that 

 of No. 1 in experiment (4). 



(7) Attach a large capillary, repeat observations. 



(8) Attach a fine capillary and repeat observa- 

 tions. What is the relation of pressure to 

 height of column? Does pressure vary as 

 height or as the square root of height? 



(9) (a) What is the relation of pressure to the 

 central resistance (Re)?/, e., the resistance be- 

 tween the point of observation and the reservoir, 



() What is the relation of pressure to distal resist- 

 ance (Rd)? /. e., the resistance between the 

 point of observation and the point of discharge. 



(<:) Which if either of the following formulae repre- 

 sents the facts: 

 (11 ) PxRc. 

 (11') PxRd. 



