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146 HARSHBERGER— STUDY OF THE CLOVERS. 



stellatum; 20, filiforme; 21, riihens; 22, diihiwn; 23, ochroleiicum; 

 24, minus; 25, angustlfolium; 26, elegans; 28, alexandrinum; 29, m- 

 carnatum; 30, striatum; 31, redinatum; 32, patens; 33, maritimum; 

 34, rubcns; 35, cam^pestre ; 36, maritimum; 37, cernuum; 38, bocconi; 

 39, hybridum (old) ; 40, agrariiiin (mature) ; 41, glomeratum, ; 42, 

 incarnatum; 43, pratense mammoth; 44, pratensc (old) ; 45, repens 

 (old) ; 46, repens var. macrorhiza; 47, johnstoni; 48, pannonicum; 

 49, ochroleiicum; 50, redinatum; 51, procumbens; 54, reflexum; 55, 

 pratense X pratense X medium; 56, badium; 58, perreymondi; 59, 

 arvense; 60, aureum; 61, scabrum.; 62, repens perenne; 63, agrarium 

 (young).- Not all of the records are good. Some of them are in- 

 complete owing to the stoppage of the driving clock, or to the swing- 

 ing of the level away from the recording cylinder owing to the dis- 

 turbance of the lever stand. Occasionally the thread would break 

 loose from the shellac fastening. As a result of these difficulties, 

 some of the records are only part curves, and, therefore, can not be 

 considered in the subsequent discussion. Only those records are 

 discussed and illustrated which are fairly complete. It was found 

 impracticable after the taking of the curve of the first species (T. 

 resupinatum) to make the curve of temperature on the same record 

 sheet as the curves of the leaflet movements. No attempt, therefore, 

 was made to take the temperature in subsequent records. The rela- 

 tive humidity was not recorded in connection with the experimental 

 study of the plants, nor was the relative amount of sunlight and cloud- 

 iness registered. Some changes in the curves of the night period 

 suggest that it might have been advisable to have data on the times 

 and intensity of the moonlight. The curves which are discussed in 

 the following pages may be criticized, as approximations, because no 

 record of temperature, humidity, sunlight, and cloudiness were kept 

 in connection with them. This criticism is undoubtedly well founded, 

 but the several complete curves are given, because they are suggestive 

 of the character of the clover-leaf movements and may create enough 

 interest for some one else to continue the careful investigation of 

 such leaf movements as related to all of the influential environmental 

 factors. 



- The numbers here given apply to the drawings of seedlings (Plates I- 

 III) and leaf movements (Plates IV-V). 



