1848.] 



Observations made on a Botanical Excursion. 



411 



Mirzapur Terrestrial Radiation at 

 Sun-rise. 



Air in Shade. 



60.0 

 62.5 

 63.0 

 58.0 

 Mean, 60.8 



Exposed 

 Th. 



55.0 

 54.5 

 55.5 

 53.0 

 54.5 



Diff. 



5.0 

 8.0 

 7.5 

 5.0 

 6.3 



Exposed on 

 earth. 



56.0 

 50.5 

 54. 

 53.5 



Diff. 



Exposed 

 on grass. 



. . 



52.0 



6.5 



52.5 



12.5 



50.5 



4.0 



50.0 



7.6 



51.2 



Diff. 



8.0 



10.0 



12.5 



8.0 



9.6 



Mirzapur, March 9th-13th, 1848. 





Temperature. 



Wet Bulb. 



O 



£ o 



a p. 



Dew Point. 



o p, 



ss 

 p* 



o 

 o o 



PnO 



Saturation. 



o 





p 



ei 

 01 





c 



4) 

 be 



p 



S3 

 cS 

 0) 



fa' 

 S 

 (4 



SB 

 S 



B 





* 



£« 



S3 



S 

 ea 



s 



1 





B 



ill 



Sis 



B > 





g 



s 



i 



PS 



g 



§ 



£ 





g 



g 



§ 



£ 



% 



E> 



3 



S 



i 



£ 



Sun-rise, •• 



61.1 



63 



58 



5 



48.8 



51.5 



47. 



.236 



34.3 



39.7 



29.7 



32.8 



23.8 



2.574 



.405 



.450 



.327 



3 



9 A. M--- 



76.1 



83 



71 



12 



58.5 



56.5 51.7 



.302 



41.9 



•• 





52.3 



15.7 



3.271 



.324 



.603 



.176 



3 



3 P. M.-.-- 



86. 









61.7 



24.3 •• 



.295 



41.3 







44.7 





3.089 



.264 







1 



9 P. M.--.. 



76. 









63.5 



12.5 





.480 



55.2 







20.8 





5.127 



'.511 







1 



During my passage down the Ganges the rise of the dew point was 

 very steady, the highest means being at the lowest point on the river, 

 Bhaugulpore, which as compared with Mirzapore, showed an increase 

 of 8° in temperature and of 30°. 6. in the rise of the dew point. The 

 saturation point at Mirzapore was .331, and at the corresponding hours 

 at Bhaugulpore .742. (Saturation being represented as unity.) The 

 observations were taken at the house of my friend Dr. Grant. 



It is remarkable that nocturnal radiation as registered at sunrise is 

 much more powerful at Mirzapore than on the more exposed Kymaon 

 plateaus ; the depression of the thermometer freely exposed being 3° 

 greater ; that laid on bare earth 6°, and that on the grass 1°.4 greater 

 on the banks of the Ganges. 



3 i 



