BY THE BOILING POINT OF WATER. 239 
great range of elevation, he states, that having deduced the heights by my for- 
mula, he finds that it “is certainly not applicable to the Sikkim Himalaya,” but 
that Captain Borzau’s Tables, founded on M. Recnautr’s, give, at all ordinary 
elevations, a “very close approach to accuracy, on the mean of many observa- 
tions.” We find, however, from the results which Dr Hooker has himself given 
at page 458, the average difference of the barometric and thermometric results is 
far from showing a close agreement, and seems to throw a doubt on the suffi- 
ciency of the observations for testing one formula rather than another. 
The average error (without respect to sign) of each observation is about 140 
feet, or 0°-26 of a degree, whilst it occasionally rises to half a degree, or even a 
whole degree; and this by the formula preferred by Dr Hooker. The average 
deviation of my observations from the formula is only 0°08. 
Desiring to arrive at the exact truth, and to test the alleged inapplicability 
of a linear formula to the-Indian observations, I wrote to Dr Hooxer, requesting 
him to send me as large a selection as possible of direct comparisons between the 
barometer and the boiling point at different heights. With this request he most 
kindly complied, sending me (with much trouble to himself) a long series of com- 
parisons, which he had drawn from his original note-books. From the extent 
and range of these, I consider them well worthy of preservation, and accordingly 
transcribe them in the following Table. 
Sikkim, Himalaya, Boiling Points. 
season gc, alk ame 
Great Rungeet River, . D108.) ae 29-211 
Bhomsong, . Zi 0 2a 28°559 
Gt. Rungeet TaTone oe 208:4 207°8 27-972 
Do., 3 208°4 207-7 27-781 
Choongtam, . : E 202'5 202-6 24-697 
Dengha, 200:6) ware 23°726 
Mr Muxuer’s (Dorjiling), nee ehO9eO 23-372 
Do., . 199°6 199°5 23°358 
Dr CampBet’s (Dorjiling), 2001 200-1 23°369 
Mr Hopeson’s Gast ) 199'5  199°3 23030 
Sinchul, J 977: OR ae 21-892 
Lachoong Village, : 196-4 ... 21-928 
Do. pave 6 , 1964... 21°751 
Lamteng, . é ; LOG3 6 cs. 21654 
Zemu Samdong, . } 195:9 196-1 21-605 
Do., . C : 196°3 196-2 21:596 
Dorn : : 196°3 196-1 21:633 
Mainom, 193-4... 20:480 
Junction of Zemu & Thlonok, 192-6F 192-6 20°212 
Tallum Samdong, ; 191-4 191-6 19-758 
Do; 3 : : 192-1 - 192-2 19:881 
Yeumtong, . : 5 191-1 191-2 19-490 
Do. 2 c : ONES s eee 19-505 
* S means small and L large Thermometer. 
f 193-6 in my “ Journals,” by error apparently ; for I find 192°6 in my Note- 
book and Calculation-book —J.D. H. 
-VOL. XXI. PART II. 3s 
