Note 320 — Chapter XXVI

During the thirty days spent at Tumloong, the temperature was mild and equable, with much cloud and drizzle, but little hard rain; and we experienced violent thunder-storms, followed by transient sunshine. Unlike 1848, the rains did not cease this year before the middle of December; nor had there been one fine month since April. The mean temperature, computed from 150 observations, was 50·2°, and from the maximum and minimum thermometer 49·6°, which is a fair approximation to the theoretical temperature calculated for the elevation and month, and allows a fall of 1° for 320 feet of ascent. The temperature during the spring (from 50 observations) varied during the day from 2·4° to 5·8° higher than that of the air, the greatest differences occurring morning and evening. The barometric tide amounted to 0·091 between 9.50 a.m. and 4 p.m., which is less than at the level of the plains of India, and more than at any greater elevation than Tumloong. The air was always damp, nearly saturated at night, and the mean amount of humidity for ninety-eight observations taken during the day was only 0·850, corresponding to a dew-point of 49·6°, or 5·2° below that of the air.