48 
Records of the Geological Survey of India. 
[vol. X. 
open valley of the Satpuras, traversed by the Dudhi river, south of the wide plains of the 
Narbada valley, about half-way between Jabalpur (Jubbulpore) and Hoshungabad, which are 
150 miles apart. At these two places the temperature-conditions are as follows :— 
Monthly Mean Temperatures. 
Jubbulpore 
Hoshungabad 
Jan. 
... 617 
,.. 66-5 
Feb. 
66-2 
71’2 
March. 
75-1 
79-8 
April. 
85-4 
88*4 
May. June. 
90-9 867 
93‘3 86-8 
July. Aug. 
78‘5 77-8 
78-8 78-3 
Sep. Oct. 
78-5 73'6 
79'5 77'3 
Nov. Dec. 
66-0 62-0 
71'5 68-3 
Jubbulpore 
Hoshungabad 
... 
Yearly, 
75-2 
78-3 
... 1,351 feet above sea-level. 
... 1,020 „ 
Extremes 
in 1875 in 
shade. 
Jubbulpore 
Hoshungabad 
... 
... 
Max. 111° 
jj 114° 
7th June 
19th May 
Min. 34° 
40° 
3rd February. 
22nd January. 
The elevation of Manegaon may be about 1,400 feet. The mean temperature, I should 
think, must be quite equal to that of Jabalpur. The extremes are certainly greater; 
in these more sheltered valleys a strong hoar-frost occurs many nights in January and 
February ; and the heats of summer are also more concentrated. This mean surface tem¬ 
perature is still a very uncertain element of the ground temperature question here. 
The geological conditions of the position are favourable for these observations. The 
rocks consist of steady alternations, in about equal proportions, of fine softish sandstones, 
and hard silty clays of the upper Gondwana strata having a steady dip of about 10°. The 
raison d’etre of the borings is, of course, the conjecture that the coal-measures may be 
within reach below. There can scarcely be a doubt that they are present, but the depth 
cannot be estimated with any certainty. Strong trap dykes are frequent in many parts of 
the stratigraphical basin; but there are none within a considerable distance of these 
borings. There are no faults near, nor any rock-features having a known disturbing effect 
upon the heat-distribution. 
If, then, we may for the present disregard the uncertain element of the mean temper¬ 
ature at the surface of the ground, and take the constant temperature of 81° at a depth of 
60 feet, the readings below that point in the Manegaon bore give a very steady rate of 
increase of 1° Fahrenheit for every 66 feet of depth. The bottom reading in the Khappa 
boring may be taken as supporting this conclusion. 
DONATIONS TO THE MUSEUM. 
(October to December 1876.) 
Carbonate of Iron, largely mined at Brendon Hill, Somer¬ 
setshire, for making Bessemer Steel ... ... II. B. Medlicott, Esq. 
Boulder of (?) auriferous quartz; from North Lakkimpur, 
... Major L. Worthington 
Wilmer. 
... T. J. Whitty, Esq. 
Slab of Coal shale with fossils from Kurhurbari ... 
