372 METEOROLOGY. MIRZAPORE. Appendix A. 



partakes of this increase. When the alluvium does not cover the 

 rock, as at Eotas and many other places, especially along the 

 southern and eastern ridges of the ghats, the nights are considerably 

 cooler than on the banks of the Soane ; and at Rotas itself, which 

 rises almost perpendicularly from the river, and is exposed to no such 

 radiation of heat from a heated soil as Shahgunj is, I found the 

 temperature considerably below that of Akbarpore on the Soane, 

 which however is much sheltered by an amphitheatre of rocks. 



"V .—Mirzapore on the Ganges. 



During the few days spent at Mirzapore, I was surprised to find 

 the temperature of the day cooler by nearly 4° than that of the hills 

 above, or of the upper part of the Soane valley, while the nights on the 

 other hand were decidedly warmer. The dew-point was even lower 

 in proportion, 7°.6, and the climate consequently drier. The following 

 is an abstract of the observations taken at Mr. Hamilton's house on 

 the banks of the Ganges (page 373). 



It is remarkable that nocturnal radiation as registered at sunrise 

 is much more powerful at Mirzapore than on the more exposed 

 Kymore plateau ; 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 Granges. 



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

 was very steady, the maximum occurring 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 corre- 

 sponding hours at Ehaugulpore "742. 



