Amphicarpcea monoica. 2', 



callv shown. Watering the greenhouse always retarded 

 movement. In the middle of the day, I feel sure great 

 heat, and want of fresh air affected the rapidity, even when 

 moisture- was sufficient. 



The above may serve to indicate general conditions. For 

 further information, the reader is referred to the tables on 

 succeeding pages, when- have been recorded the results of 



some of the experiments with necessary details. 



( )n July 22, a clear, sunny day, four plants were care- 

 fully observed in the greenhouse for twenty-four hours. 



Plant i was supported; it was 15 inches high, 8 inches 

 being free. At the close of the twenty-four hours the height 

 was 17 ' .. inches. 



Plant 2 was unsupported. It was 12JJ inches at the be- 

 ginning and 15 inches high at the close of the series. 



Plant 3 was supported. It was 18 v.' inches high on July 

 22, and 21 ' j inches on July 23. Nine inches were free. 



Plant 4 was unsupported. It measured 10^ inches at 

 the beginning, and 12 >< inches at the close of the series. 



The necessary handling for measuring, arranging, etc., 

 probably affected the results of the first circumnutation. 

 The time records for the night hours show a gradual in- 

 crease until about 2.04 a.m.; after that a steady decrease. 

 The temperature, it will be noticed, varied very little for 

 nearly twelve hours, and yet the length of time required 

 was longer at 3 a.m. than it was at 7 p.m. The free portions 

 of these plants frequently curved, so that the time of move- 

 ment was remarkably increased at some times, perhaps di- 

 minished at others. This is the only explanation of those 

 results which tend to depart from the beautifully graded 

 series. The size of circle increased rapidly, with elonga- 

 tion of the stem, but as the preceding table gives an idea 

 of the varying sizes, together with the time required for 

 their completion, I have omitted those details here. 



During the hours between 9.30 a.m. and 12, it will be 

 noticed that several results of less than an hour have been 



obtained. 

 20 



