| NINE P.M. | |||
| Exposed thermometer | On earth | On grass | |
| Temperature Mean diff. from air Max. diff. from air Number of observations | 61·2 6·8 10·5 10 | 64·3 4·6 8·5 9 | 55·8 11·8 17·0 9 |
| MORNING | ||||
| Time | Temp. | Black Bulb | Diff. | Phot. |
| 11.30 a.m. 10.30 a.m. Noon Noon Noon Noon | 85·5 89·0 90·0 85·0 86·0 90·0 | 129 132 132 130 138 138 | 44·5 43·0 42·0 45·0 52·0 48·0 | -- -- 10·140 -- -- -- |
| Mean | 87·6 | 133 | 45·8 | 10·140 |
| AFTERNOON | ||||
| Time | Temp. | Black Bulb | Diff. | Phot. |
| 3 p.m. -- -- -- -- | 85·5 92·5 92·0 89·5 93·5 | 116 128 120 128 144 | 30·5 35·5 28·0 38·5 50·5 | -- -- -- -- -- |
| Mean | 90·6 | 127 | 36·6 | -- |
| SUNRISE | ||||||
| Air temperature | Barley | Diff. | Calo- tropis | Diff. | Arge- mone | Diff. |
| 61·0 57·0 57·0 58·5 57·0 50·0 50·5 56·0 | 56 46 52 52 52 45 43 -- | 5·0 11·0 5·0 6·5 5·0 5·0 7·5 -- | 56·5 48·0 -- -- -- 45·5 -- -- | 4·5 9·0 -- -- -- 4·5 -- -- | 57·0 50·0 50·0 -- -- -- -- 49·0 | 4·0 7·0 7·0 -- -- -- -- 7·0 |
| 55·9 | 49·4 | 6·4 | 50·0 | 6·0 | 51·5 | 6·2 |
| NINE P.M. | ||||||
| Air temperature | Barley | Diff. | Calo- tropis | Diff. | Arge- mone | Diff. |
| 68·5 70·0 69·0 74·0 62·5 67·5 61·0 | -- -- -- -- 51·5 67·5 50·0 | -- -- -- -- 11·0 10·0 11·0 | -- 65·0 57·0 59·0 -- 62·5 -- | -- 5·0 12·0 15·0 -- 5·0 -- | 56·0 67·0 57·0 -- -- -- -- | 12·5 3·0 12·0 -- -- -- -- |
| 67·5 | 56·3 | 10·7 | 60·9 | 9·3 | 60·0 | 9·2 |
The upper course of the Soane being in some places confined, and exposed to furious gusts from the gullies of the Kymore hills, and at others expanding into a broad and flat valley, presents many fluctuations of temperature. The mean temperature is much above that of the lower parts of the same valley (below Tura), the excess amounting to 5.4°. The nights and mornings are cooler, by 1·2°, the days hotter by 10°. There were also 10° increase of range during the thirteen days spent there; and the mean range from day to day was nearly as great as it was on the hills of Bengal.
There being much exposed rock, and the valley being swept by violent dust-storms, the atmosphere is drier, the mean saturation point being ·454, whereas in the lower part of the Soane’s course it was ·516.
A remarkable uniformity prevails in the depression of thermometers exposed to nocturnal radiation, whether laid on the earth, grass, or freely exposed; both the mean and maximum indication coincide very nearly with those of the lower Soane valley and of the hills. The temperature of tufts of green barley laid on the ground is one degree higher than that of short grass; Argemone and Calotropis leaves maintain a still warmer temperature; from the previous experiments the Argemone appeared to be considerably the cooler, which I was inclined to attribute to the smoother and more shining surface of its leaf, but from these there would seem to be no sensible difference between the radiating powers of the two plants.
IV.—TABLE-LAND OF KYMORE HILLS
(Mean elev. 979 feet)
| February 20th to March 3rd | ||||
| Hour | Sunrise | 9 a.m. | 3 p.m. | 9 p.m. |
| TEMPERATURE Mean Max. Min. Range | 65·3 69·0 57·5 11·5 | 81·6 83·5 79·5 4·0 | 88·1 90·0 84·5 5·5 | 71·1 76·0 68·0 8·0 |
| WET-BULB Mean Max. Depression Min. Depression | 57·7 8·0 6·0 | 65·3 19·0 14·0 | 63·3 26·5 21·5 | 60·3 13·0 8·3 |
| Elasticity of Vapour | 0·428 | 0·468 | 0·324 | 0·433 |
| DEW-POINT Mean Max. Min. Max. Depression Min. Depression | 52·0 55·5 45·9 14·1 11·6 | 54·5 57·9 49·0 33·0 12·9 | 43·7 47·8 37·9 46·6 42·2 | 52·3 56·7 46·8 21·9 13·8 |
| Weight of Vapour in cubic feet | 4·710 | 5·000 | 3·417 | 4·707 |
| SATURATION Mean Max. Min. | ·647 ·741 ·648 | ·421 ·479 ·344 | ·240 ·295 ·214 | ·542 ·643 ·491 |
| Number of observations | 4 | 3 | 3 | 4 |
| Extreme variation of temperature | 32·5° |
| Extreme variation of relative humidity | ·527 |
| Extreme diff. solar and nocturnal radiation | 110·5° |