1835.] 



Meteorological Observations at Nasirabdd. 



49 



[In the foregoing correspondence, allusion is made to a prior knowledge of 

 the tea-plant of Assam. The following extract from Captain Wilcox's Memoir 

 of a Survey of Assam, published in the Asiatic Researches XVII. p. 448, proves 

 that officer to have been aware of its existence in the hills east of Sadiya : — he 

 writes from Manch£, a Khamti village, latitude 27° 29' 16", longitude 97° 29': — 

 " according to promise, a specimen of the tea tree was brought to me from one 

 of the neighbouring low hills ; it was a full grown one, that is about five feet 

 high ; the leaves were coarse and large, and not numerous." Mr. Scott and 

 Captain Davidson had also frequently seen it, and the latter officer says, that 

 black tea is now brought to Goalpara from the Bhotan hills. In 1828, Capts. 

 Grant and Pemberton sent specimens of what the natives asserted to be the 

 tea plant to Mr. Secretary Swinton, from M^nipur, but for want of the fruit, 

 its genuine nature was not identified. These travellers made tea from its leaves, 

 and found it approach very nearly in flavour to ordinary black tea. — Ed.] 



V. — Abstract of Meteorological Observations at Nasirabdd. By Lieut.' 



Col. Thomas Oliver. 



Table I. — Barometer reduced to 32°. Temperature of the External Air, and resulting 



elevation above Calcutta. 



Year and 

 Month. 



Barom. 

 at 4 p.m. 



Temp, of 

 Air. 



Eleva- 

 tion. 



Year and 



Month. 



Barom. 



at4 P.M.J 



Temp, of 

 air. 



Eleva- 

 tion. 



Dec. 1832, .. 

 Jan. 1833, .. 

 Feb 



28-432 

 •504 

 •392 

 •334 

 •234 

 •059 

 •031 

 27-965 

 28*021 

 •090 

 •296 

 •425 







55-7 

 71-4 

 74-5 

 84-8 

 96-9 

 102-4 

 102-2 

 97*1 

 93-9 

 98-5 

 93-7 

 80-6 



Feet. 



1461 



1440 



1437 



1431 



1460 



1545 



1518 



1543 



1543 



1507 



1484 



1497 | 



Dec. 1833, .. 

 Jan. 1834, . . 

 Feb 



28-391 

 •402 

 •392 

 •281 

 •212 

 •101 



27980 

 •977 



28*001 







65-4 

 70-0 

 76-5 

 86-5 

 93-8 

 103-8 

 101-0 

 88-1 

 88-2 



Feet. 

 1518 

 1511 

 1501 



July 



Sept 



May, 



1538 

 1556 

 1512 

 1572 

 1576 

 1534 







Oct 



Oct. 

















28-232 



88-5 



1489 





1 







It is remarkable that the elevations for the nine months, since December, 1833, are 

 all with one exception so much in excess to those for the same months of the former 

 year : I am at a loss to account for this ; the average height of my Barometer for 

 the nine months in question being only "026 lower than the average for the same 



months of the preceding year. 



Table II. — Mean Temperature of each Month, with the Differences from the Mean 



of the Year. 



Months. 



January, . . . 

 February, , 



March, 



April, 



May, 



June, ... , 



July 



August, . . 

 September, 

 October, . . 

 November, 

 December, 



Means, 



H 



Temp. 

 Day. 



Diff. 



from 

 Mean. 











61-5 



— 17-9 



67-8 



— 11-6 



75-4 



— 4-0 



85-2 



-|- 5-8 



94-6 



-J- 152 



936 



4- 14-2 



88-3 



+ 8'9 



86-1 



+ 67 



86-6 



-f- 7-2 



82-0 



+ 2-6 



72-7 



— 6-7 



58-7 



— 20-7 



79*4 





Temp. 

 Night. 



57-9 

 605 

 71-9 

 80-9 

 89-9 

 88-8 

 84-7 

 82-1 

 83*1 

 78 

 69-6 

 55-6 



Diff. 



from 

 Mean. 



75-3 



17-4 



14-8 



3*4 



56 



14-6 



13-5 



94 



6-8 



7-8 



27 



5-7 



19-7 



Temp. 

 Sun-set. 



o 

 66'0 

 67"7 

 80.7 

 88-5 

 96-9 

 94-6 

 88-0 

 86-4 

 87-7 

 85-5 

 77-1 

 63-0 



81-8 



Diff. 

 from 

 Mean. 



15*8 



14'1 



l'I 



6'7 



151 



12'8 



6-2 



4-6 



5*9 



3-7 



4-7 



18-8 



