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 days, taking observations; on the 25th it cleared, and the snow soon melted. Frosty nights succeeded, but the thermometer only fell to 31 degrees once during the month, and the maximum once rose to 62.5 degrees. The mean temperature from the 9th to the 30th September was 41.6 degrees,* [The result of fifty-six comparative observations between Calcutta and Momay, give 40.6 degrees difference, which, after corrections, allows 1 degree Fahr. for every 438 feet of ascent.] which coincided with that of 8 a.m. and 8 p.m.; the mean maximum, 52.2 degrees, minimum, 34.7 degrees, and consequent range, 17.5 degrees.* [At Dorjiling the September range is only 9.5 degrees; and at Calcutta 10 degrees.] On seven nights the radiating thermometer fell much below the temperature of the air, the mean being 10.5 degrees and maximum 14.2 degrees; and on seven mornings the sun heated the black-bulb thermometer considerably, on the mean to 62.6 degrees above the air; maximum 75.2 degrees, and minimum, 43 degrees. The greatest heat of the day occurred at noon: the most rapid rise of temperature (5 degrees) between 8 and 9 a.m., and the greatest fall (5.5 degrees), between 3 and 4 p.m. A sunk thermometer fell from 52.5 degrees to 51.5 degrees 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 0.062 of an inch. On the 28th of the month the Singtam Soubah came up from Yeumtong, to request leave to depart for his home, on account of his wife's illness; and to inform me that Dr. Campbell had left Dorjiling, accompanied (in compliance with the Rajah's orders) by the Tchebu Lama. I therefore left Momay on the 30th, to meet him at Choongtam, arriving at Yeumtong the same night, amid heavy rain and sleet.