1848.] 



Observations made on a Botanical Excursion. 



393 



damp atmosphere, than I ever experienced in the drier plains of 

 India. In a damp climate the greatest intensity may be expected in 

 the forenoon, where the vapor forms a thin and uniform stratum near 

 the earth's surface ; in the afternoon the lower strata of atmosphere 

 are drier but the vapor is condensed into clouds aloft which more effec- 

 tually obstruct the sun's rays. On the Birbhoom and Behar hills, where 

 the amount of vapor is so small that the afternoon is but little drier 

 than the forenoon, there is little difference between the solar light at 

 each time. In the Soane valley again, where a great deal of humidity 

 is removed from the earth's surface and suspended aloft, the obstruc- 

 tion of the sun's light is very marked. 



I have given a few observations on the temperatures of the leaves of 

 two plants during the night, Argemone Mexicana and Calotropis proce- 

 ra, to which I shall allude when more shall have been taken. 



DlJNWAH TO SOANE RlVER, AND UP SoANE TO TuRA, 



Feby. 10th-19th. 





Temperature. 



Wet. Bulb. 





Dew Point. 







S. Satura- 



8 

















tion. 



,Q 









1 





fli s 





1 Si fl 



































O O 













i 



<u 



i 



a 



bo 



a 



S3 

 OS 



Max. 



epressi 

 ~ Min. 

 epressi 



+3 ee 



3 



OS 



X 



OS 



in. 



Max. 



epressi 

 _ Min. 



epressi 



boo 



'53 a 



B 

 oS 



x' 

 05 



a 



II 



3 > 





!S 



§ 



£ 



« 



§ 



Q| Q 





s 



§ 



S | O 



a 



3 



£ 



£ 



& 



Sunrise, 



57.6 



62.0 



53.5 



8.5 



51.7 8.5 



3.8 



0.352 



46.1 



53.6 



1 

 40.6 16.9 



7.0 



3.930 .680 



•787 



.566 



10 



9 A. M--- 



74.0 1 81.0 



63.5 



17.5 



59.5 18-5 4.0 



0.382 



48.5 56.7 



38.0 33.5 



6.8 



4.066 .460 



.818 



.338 



8 



3 P. M.---. 



77.6,87-5 



71.0 



16.5 



59.9 26.0 



6.8 



0.357 



46.4 



60.0 



36.0 



44.2 



11.0 



3.658 1 .352 



l 



.703 



.237 



9 



*) P. M.-». 



64^68.7 



60.0 



8.7 



55.5 12.5 



I 



2.5 



0.370 



47.5 



55.6 



41.0 24.1 



1 



4.4 



4.014 .572 



.860 



.452 



10 



Extreme variation of Temperature = 34.0 



,, ,, ,, Saturation = .623 



„ diff. between Solar and Nocturnal Radiation = 80.5 



