160 - Proftfor Marryn’s Odfervations on 
grow flaccid, and wither before noon the next day; but in cool 
and cloudy weather they will laft two days. 
The flowers of Hibifcus 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 erect. 
In warm weather the corolla folds up wholly at night, and decays 
on the fecond day; but in cool weather it will laft a day or two 
half folded up, but never opening fo as to fhow 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 g 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 
arvenfis, Oenothera biennis, Hibifcus trionum, &c. during the 
Autumn of 1796. 
Barom. | Therm. Weather. Obfervations. ° . 
Aug. 16. | 297%o 66° Dry, funfhine and clouds alter- | Hibifcus trionum open from 8 
nately, Wind N. E. to 4. 
17. } 294% | 61 to 64 }| The fame, only more cloudy. Hibifcus trionum open from 8 
r to 4. 
18. | 2925 | 61 to 64 | The fame, morning covered. Hibifcus trionum open from 10 
to 4. 
19. | 2975 | 62 to 66 | The fame, but warmer. Hibifcus trionum open from 9 ~ 
to 4. 
20. | 2975 | 62 to 68 | Fog, foon cleared, hot. Hibifcus trionum open from 9 
to 4. 
23. | 293% | 64 to 70 | Clear, hot. Wind E, ‘Hibifcus trionum open from 8 
a to 4. 
22. } 29343 | 64to 71 | The fame. Hibifcus trionum open from 8 
tO 4. 
