100 



Absorption of Water by Roots of Plants. 



In work done along this line it has always been necessary 

 to use apparatus which had to be hermetically sealed. This is 

 frequently inconvenient and for that reason something new was 

 sought with which to secure results in a series of experiments 

 on absorption of water. The following described piece of ap- 

 paratus was constructed and gave excellent satisfaction. Under 

 conditions in which the neck of the bottle is small it is sen- 

 sitive to one tenth of a cubic centimeter. 



Description of Apparatus, 



The glass tube A Plate 1 is about forty centimeters long 

 and has a diameter of thirteen and one half millimeters The 

 lower end of this tube is closed by a tight fitting cork into 

 which the S shaped, six millimeter glass tube extends. This 3 

 tube ends flush with the inner end of the cork. The longer 

 end of the tube S passes through a cork C and extends some dis- 

 tance below the other end of the S. The large cork through 

 which the crooked tube passes has a portion cut away so as to 

 leave the opening for the plant when the stopper is in po- 

 sition. The upper end of the tube A is also closed with a cork 

 through which a glass tube of six millimeters diameter extends. 

 This glass tube T has its lower end about one centimeter above 



