In the register from which this abstract is taken, the numbers were marked every day at nine o'clock A. M. The quantity of rain was measured by means of a tin-cylinder, guarded by a wooden box, and sunk in the earth, into which the rain was received through a funnel, whereof the area was quadruple that of the cylinder. A gage, which floated on the surface of the water in the cylinder, had a rod fixed to it, divided into inches and tenths, which passed through the pipe of the funnel. The fourth part of the rise of this index marked the depth of rain which had fallen since the last observation, and these observations were generally made once in twenty-four hours.