306 EDITH BELLAMY SHREVE 



Material: Plant No. 4, an individual with two branches grown in the open 

 and three in the green-house. The measurements were made on the branches 

 which grew in the green-house. The soil has been kept continuously moist for 

 over a month. 



Results: The data are recorded in table 2 and given in graphic form in figure 3. 



Experiment 2. March 12-13, 1914. 



Object: The measurement of movements at intervals during the day, with a 

 single measurement for the night, under green-house conditions and with the 

 plant recovering from drought in wet soil. 



Material: Plant No. 8, an unbranched small individual which made its growth 

 in the open. The previous history of this plant is shown in figure 1. At the time 

 of the experiment it was in position 3. The soil had been kept continuously wet 

 since the watering on January 21 . At 7 p.m. on March 12 a small amount of water 

 was given in order to prevent even a slight drying lut during the night. A small 

 "w" on the graphs always indicates the time at which water was added. 



Results: Data are given in table 3 and figure 3. 



Experiment 3. March 10-12, 1914. 



Object: The measurement of changes in position at frequent intervals, under 

 green-house conditions and in soil which is gradually drying out. 



Material: Plant No. 3, a three year old, which had spent its entire life in the 

 green-house. It was 50 cm. high and bore three branches. All three branches 

 were in positions intermediate between 1 and 2 in figure. 1. 



Results: The data are given in table 4 and figure 3. 



Experiment 4. March 9-11, 1914. 



Object: The measurement of changes in position at frequent intervals under 

 green-house conditions and in wet soil, using plants which have never suffered 

 from drought. 



Material: Plants No. 11 and 12. Both were small individuals about 15 cm. 

 high and were in erect positions. They had made their entire growth in the 

 green-house. 



Results: Data appear in table 5 and figure 3. 



Experiment 5. 



Object: The duplication of experiments 1-4. 



Material: Plants Nos. 1, 2, 4, and 5. 



Method: Experiments 1-4 were repeated under as nearly identical conditions 

 as could be obtained on different days. 



Results: The data were in all respects similar to those in the previous experi- 

 ments; so that the graphs of these experiments would, if slightly smoothed, 

 represent the graphs for the movements in experiment 5. 



Experiment 6. 



Object: The measurement of movements for day and night under extremely 

 desiccated conditions of soil and plant, and later of movements of the same 

 plants after irrigation. 



Material: Plants Nos. 3, 4, 7, and 8. All had received no water for two months 

 and the branches were in the lowest possible positions. 



Results: Measurements extending over two weeks showed no movement either 

 during the day or at night for plants under conditions of extreme desiccation. 

 Measurements during two days and nights immediately after irrigation showed a 



