On the Statistics of Duhhan. SJn*^. 



was 75° Fahrenheit; at Cheltenham, G4°-6. In St. Petersburgh, the 

 thermometer has been as low as 36°-7' U^oiv zero, and as high as 91° -4 ; 

 the range, therefore, 127°'l. At Berne, the annual range has been more 

 than 75"*. In 1 observed a range of SS'' ^, viz., from 93°-9 on the 



I2th March, to 40° 50 on the 1 5th January at sunrise. In 1827, the 

 maximum range observed by me was 48^-8, viz., from 96''-8 on the 28th 

 March, to 48° on the 12th December at sunrise. In 182S, the maximum 

 occurred on the 7th May, being 101°, and the minimum was 56°, the 

 range, therefore, 45° ; but, for a very short time, the thermometer rose 

 on the 7th May, between two and three o'clock, to 105° ; and this was 

 the more remarkable as I was then encamped on the edge of the Gh^ts 

 at the source of the Beema river, at an elevation of 3090 feet above the 

 level of the sea. This instance of unusual height of the thermometer, 

 however, is not confined to Dukhun, for we learn from M. Arago, that it 

 has been higher than 10 1'^ Fahrenheit in the shaae in Paris. 



Monthly jjieans. — The monthly means do not dirler more than from 13° 

 to 17° from each other. In 1826, the differen/je between the hottest 

 month (May, 8S°-28), and the coldt-st (Japuary, 65° 90), was only 

 17°'38. And in 1829, March was the hottesl month, and November the 

 coldest, their difference of means being lo°*66. 



Diurnal range. — The greatest diurnal range in 1823 was on the 5th 

 March, being 3r°-30, from 50°-5 to 8;°-8. In 1827, it was 3- °-5, on 

 the 12th December, from 49°-5 to 89°. In 182S, it was 34°-8, on the 

 1 6th July, from 56° to S0°-8. In 1829, the maximum diurnal range was 

 37° '5 in December. The minimum diurnal range occurs in the monsoon 

 months of June, July, August, and September; indeed, occasionally, on 

 some days in those months, the mercury does not move at all. 



Mean Temp rature. — In 1828, Dr. Walker, at Ahmednuggur, at an 

 elevation of 1900 feet above the sea, made the mean temperature- 78° ; 

 and though I was living in tents, and moving ;^ about the country, I made 

 it only 77° '93. Of course, on higher or lower levels this mean tempera- 

 ture will be diraini.^hed or increased. It is necessary, however, to note 

 one remarkable fact, namely, that the mean temperature of places on the 

 table-land of the continent of India is much higher than the calculated 

 mean temperature of the sam^ places agreeably to Mayer's formula. The 

 calculated mean temperature of Ahmednuggur is 72°'27, observed 78°; 

 of Poona 72° 78, obsei-ved 77° *7; of Mhow, in Malwa, e^^-SO, observed 

 74° : temperature of a spring in the hill fort of Hurreechundurghur 

 69° -5, calculated temperature 65° -45. 



The results of several years' observations indicate that the annual 

 mean temperature of 9°'30 a. m., is nearly identical with the mean tem- 

 perature deduced from the maxima and the minima. 



