i6o 



Profejfor Martyn'j Obfervations on 



grow flaccid, and wither before noon the next day ; but in cool 

 and cloudy weather they will laft two days. 



The flowers ofHibifcus trionum, when once expanded, continue 

 open till they clofe finally. They then droop ; and when the 

 corolla is withered and fallen, the peduncle again becomes ere6l. 

 In warm weather the corolla folds up wholly at night, and decays 

 on the fecond day ; but in cool weather it will lad a day or two 

 half folded up, but never opening fo as to (how the rich purple 

 eye at its bafe. 



The height of the barometer and thermometer, with the ftate of 

 the weather on each day, are given with a view of afcertaining 

 whether there be any connection between them and the time in 

 which the flowers open. 



The barometer was obferved between 8 and 9 A. M. and the 

 thermometer at the fame time, and again about 3 P. M. The 

 latter inftrument was within the houfe, but in a hall, the door of 

 which was commonly open, and not at all expofed to the fun. 



Obfervations on the Opening and Clofing of the Flowers of Anagallis 

 arvenlis, Oenothera biennis, Hibifcus trionum, &c. during the 

 Autumn of 1796. 



Aug. 16. 



17- 



18. 



j 9 . 

 20. 

 21. 



22. 



Barom. 



Therm. 



29 t 9 * 



66° 



*9to 



61 to 64 



*9t5 



61 to 64 



29 TIT 



62 to 66 



2 9-ni 



62 to 63 



*9t* 



64 to 70 



29 ii 



64 to 71 



Weather. 

 Dry, funfhine and clouds alter- 

 nately. Wind N. E. 

 The fame, only more cloudy. 



The fame, morning covered. 



The fame, but warmer. 



Fog, foon cleared, hot. 



Clear, hot. Wind E. 



The fame. 



Obfervations. 

 Hibifcus trionum open from 8 



to 4. 

 Hibifcus trionum open from 8 



to 4 

 Hibifcus trionum open from 10 



to 4. 

 Hibifcus trionum open from 9 



to 4. 

 Hibifcus trionum open from 9 



to 4. 

 Hibifcus trionum open from 8 



to 4. 

 Hibifcus trionum open from 8 



to 4. 



