378 The American 



They are not now crisp, but feel limp like old rags. The veins 

 are bright red, but the parenchyma is yellowish-white. The 

 surface of the stem feels moist and stains the fingers red when 

 rubbed. 



Si miliar results were obtained with a 1 per cent, solution 

 of sodium chloride containing 1 per cent, eosine. Acidulated 

 waters (1 per cent, citric acid and 1 per cent, hydrochloric acid) 

 also passed up the cut stems rapidly and in large quantity, 

 and after the stems were dead. The 1 per cent, hydrochloric 

 acid proved much more poisonous to the plant than did the 

 1 per cent, citric acid. Similar experiments were made with 

 hydrant water. In the latter, after a few days, the plants 

 reduced their foliage to a minimum, and then lived on for 

 many days, i. e., in case of a plant used for comparison with 

 No. 1, until long after the latter was dead and dry. . 



To sum up the results of these experiments, of which the 

 preceding are only examples, we have the following prop- 



(1). The rate of movement of the water current in cucum- 

 ber stems during active transpiration is at least 10 to 12 

 meters an hour. (2). Absorption of water and transpiration 

 continues in dead stems for some time, i. a, until they have 

 become dry. (3). Large quantities of fluid passed through 

 the cut stems during the first few days. (4). When the cut 

 stems were plunged into water tinged with eosine, sufficient 

 of this stain was taken up to color all the tissues of the plant 

 bright red, including parenchyma, sclerenchyma, collenchyma 

 and epidermis; the first parts to show the stain being the 

 spiral vessels. 



{To be Continued.) 



