OCR Text |
Show Characteristics of Plants. Times at which different plants I open and shut thulr pctalB have been I investigated, and- It 'is "commonly found that tho hour varies according to (ho amount of moisturo In tho air. Tho main thing is to protect tho pollen pol-len from Invading moisture, and since , some plants, such as tho pimpernel, ! promptly close tholr petals on tho noat i approach of rain, thoy oorvo as wcath or glasses. Some plants seem to bolleve In a short day'a work, the pimpernel, i for lnstanco, opening at 8 In tho morn ng and closing at 2 o'clock In the afternoon, tho goatsbeard, on the ) other band, dolnc business from 3 a. m. to 10 p. m. J |