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), MARCH 3RD TO 8TH, 1848. Hour Sunrise 9 a.m. 3 p.m. 9 p.m. TEMPERATURE Mean 65.3 81.6 88.1 71.1 Max. 69.0 82.5 90.0 76.0 Min. 57.5 79.5 84.5 68.0 Range 11.5 4.0 5.5 8.0 WET-BULB Mean 57.7 65.3 63.3 60.3 Max. Depression 8.0 19.0 26.5 13.0 Min. Depression 6.0 14.0 21.5 8.3 Elasticity of Vapour .428 .468 .324 .433 DEW-POINT Mean 52.0 54.5 43.7 52.3 Max. 55.5 57.9 47.8 56.7 Min. 45.9 49.0 37.9 46.8 Max. Depression 14.1 33.0 46.6 21.9 Min. Depression 11.6 12.9 42.2 13.8 Weight of Vapour in cubic feet 4.710 5.000 3.417 4.707 SATURATION Mean .647 .421 .240 .542 Max. .741 .479 .295 .643 Min. .648 .344 .214 .491 Number of observations 4 3 3 4 Extreme variations of Temperature 32.5 degrees Extreme variations of relative humidity .527 Extreme diff. Solar and Nocturnal Radiation 110.5 degrees NOCTURNAL RADIATION SUNRISE Exposed Th. On Earth On Grass Temperature 59.5 56.0 54.7 Mean Diff. from Air 3.5 1.5 8.2 Max. Diff. from Air 3.5 1.5 8.5 Number of Observations 2 1 2 NINE P.M. Exposed Th. On Earth On Grass Temperature 71.5 62.5 61.0 Mean Diff. from Air 3.3 5.5 8.2 Max. Diff. from Air 7.0 5.5 11.0 Number of Observations 3 1 2