144 MOM AY. Chap. XXIII. 



in Tibet, as far north as Jigatzi, where, however, violent 

 dry easterly gales are the most prevalent. 



The equinoctial gales set in on the 21st, with a falling 

 barometer, and sleet at night ; on the 23rd and 24th it 

 snowed heavily, and being unable to light a fire at the 

 entrance of my tent, I spent two wretched clays, taking 

 observations; on the 25th it cleared, and the snow soon 

 melted. Frosty nights succeeded, but the thermometer 

 only fell to 31° once during the month, and the maximum 

 once rose to 62°" 5. The mean temperature from the 9th to 

 the 30th September was 41°6,* which coincided with that 

 of 8 a.m. and 8 p.m. ; the mean maximum, 52°.2, minimum, 

 34°' 7, and consequent range, 17°'5.f On seven nights the 

 radiating thermometer fell much below the temperature of 

 the air, the mean being 10°' 5 and maximum 14°' 2 ; and on 

 seven mornings the sun heated the black-bulb thermometer 

 considerably, on the mean to 62 0, 6 above the air ; maximum 

 75° 2, and minimum, 43°. The greatest heat of the day 

 occurred at noon: the most rapid rise of temperature (5°) 

 between 8 and 9 a.m., and the greatest fall (5°'5), between 

 3 and 4 p.m. A sunk thermometer fell from 5 2° "5 to 

 51°'5 between the 11th and 14th, when I was obliged to 

 remove the thermometer owing to the accident mentioned 

 above. The mercury in the barometer rose and fell 

 contemporaneously with that at Calcutta and Dorjiling, 

 but the amount of tide was considerably less, and, as is 

 usual during the equinoctial month, on some days it 

 scarcely moved, whilst on others it rose and fell rapidly. 

 The tide amounted to 0'0G2 of an inch. 



On the 28th of the month the Singtam Soubah came up 



The result of fifty-six comparative observations between Calcutta and Momay, 

 give 40 o, 5 difference, which, after corrections, allows 1° Fahr. for every 438 

 feet of ascent. 



t At Dorjiling the September range is only 9"-5; and at Calcutta 10°. 



