[ So ] 



the plants will be earlier revived id 

 their office than when the fun is 

 hid by thick clouds. I found this 

 difference to be very remarkable, 

 fo that in a dark cloudy morning I 

 found the plants to begin their 

 daily operation an hour or two later 

 than in a clearer day. I even found 

 that all the plants in the fame gar- 

 den did not awake, if 1 may fa 

 exprefs myfelf, at the fame time 

 from their nocturnal ftupor. Thofe 

 plants, whofe expofure was fuch 

 as favoured the rays of the fun 

 being cart early upon them, were re- 

 vived earlier than thofe which were 

 lhaded by other plants, a wall, a 

 houfe, &c. Nay, I even found 

 that there was fome difference in 

 this refpecl between the leaves of 

 the fame tree ; as I found thofe 

 which were the nrft influenced by 



the 



