It is remarkable that nocturnal radiation as registered at sunrise is much more powerful at Mirzapore than on the more exposed Kymore plateau; the depression of the thermometer freely exposed being 3 degrees greater, that laid on bare earth 6 degrees, and that on the grass 1.4 degrees greater, on the banks of the Ganges. During my passage down the Ganges the rise of the dew-point was very steady, the maximum occurring at the lowest point on the river, Bhaugulpore, which, as compared with Mirzapore, showed an increase of 8 degrees in temperature, and of 30.6 degrees in the rise of the dew-point. The saturation-point at Mirzakore was .331, and at the corresponding hours at Bhaugulpore .742. MIRZAPORE (ELEV. 362 FEET), MARCH 9TH TO 13TH, 1848. Hour Sunrise 9 a.m. 3 p.m. 9 p.m. TEMPERATURE Mean 61.1 76.1 86.0 76.0 Max. 63.0 83.0 ... ... Min. 58.0 71.0 ... ... Range 5.0 12.0 ... ... WET-BULB Mean 48.8 58.5 61.7 63.5 Max. Difference 51.5 56.5 24.3 12.5 Min. Difference 47.0 51.7 ... ... Elasticity of Vapour .236 .302 .295 .480 DEW-POINT Mean 34.3 41.9 41.3 55.2 Max. 39.7 ... ... ... Min. 29.7 ... ... ... Max. Difference 32.8 52.3 44.7 20.8 Min. Difference 23.8 15.7 ... ... Weight of Vapour in cubic feet 2.574 3.271 3.089 5.127 SATURATION Mean .405 .324 .264 .511 Max. .450 .603 ... ... Min. .327 .176 ... ... Number of observations 3 3 1 1 TERRESTRIAL RADIATION. Mean Air in Shade. Sunrise 60.0 62.5 63.0 58.0 60.9 Exposed Th. 55.0 54.5 55.5 53.0 54.6 Difference 5.0 8.0 7.5 5.0 6.4 Exposed on earth ... 56.0 50.5 54.0 53.5 Difference ... 6.5 12.5 4.0 7.7 Exposed on grass 52.0 52.5 50.5 50.0 51.3 Difference 8.0 10.0 12.5 8.0 9.6 APPENDIX B. ON THE MINERAL CONSTITUENTS AND ALGAE OF THE HOT-SPRINGS OF BEHAR, THE HIMALAYA, AND OTHER PARTS OF INDIA, ETC., INCLUDING NOTES ON THE FUNGI OF THE HIMALAYA. (By Dr. R. D. Thomson and the Rev. M. J. Berkeley, M.A., F.L.S.)