deer; the flesh was good and tender, dark-coloured, and lean. I remained here till the 15th of August,* [Though 5 degrees further north, and 5,268 feet above the level of Calcutta, the mean temperature at Choongtam this month was only 12. degrees cooler than at Calcutta; forty observations giving 1 degree Fahr. as equal to 690 feet of elevation; whereas in May the mean of twenty-seven observations gave 1 degree Fahr. as equal to 260 feet, the mean difference of temperature being then 25 degrees. The mean maximum of the day was 80 degrees, and was attained at 11 a.m., after which clouds formed, and the thermometer fell to 66 degrees at sunset, and 56 degrees at night. In my blanket tent the heat rose to upwards of 100 degrees in calm weather. The afternoons were generally squally and rainy.] arranging my Lachen valley collections previous to starting for the Lachoong, whence I hoped to reach Tibet again by a different route, crossing the Donkia pass, and thence exploring the sources of the Teesta at the Cholamoo lakes. Whilst here I ascertained the velocity of the currents of the Lachen and Lachoong rivers. Both were torrents, than which none could be more rapid, short of becoming cataracts: the rains were at their height, and the melting of the snows at its maximum. I first measured several hundred yards along the banks of each river above the bridges, repeating this several times, as the rocks and jungle rendered it very difficult to do it accurately: then, sitting on the bridge, I timed floating masses of different materials and sizes that were thrown in at the upper point. I was surprised to find the velocity of the Lachen only nine miles per hour, for its waters seemed to shoot past with the speed of an arrow, but the floats showed the whole stream to be so troubled with local eddies and backwaters, that it took from forty-three to forty-eight seconds for each float to pass over 200 yards, as it was perpetually submerged by under-currents. The breadth of the river averaged sixty-eight feet, and the discharge was 4,420 cubic feet of water per second. The temperature was 57 degrees.