========================================================================== | Name | Fall of rain | Water ran off | Evaporation | Ratio YEAR. | of | and snow | in | from surface | of | valley. | in valley. | inches. | of ground. | drainage. ----------------+--------------+---------------+--------------+----------- 1835 | Madison | | | | | Brook | 35.26 | 15.83 | 19.43 | 0.449 ------+---------+--------------+---------------+--------------+----------- 1837 | Long | | | | | Pond | 26.65 | 11.70 | 14.95 | 0.439 ------+---------+--------------+---------------+--------------+----------- 1838 | Do | 38.11 | 16.62 | 21.49 | 0.436 ------+---------+--------------+---------------+--------------+----------- Mean | | | | | 0.441 ========================================================================== "Madison Brook drains 6,000 acres, and Long Pond 11,400 acres. Mr. Tracy makes the following comment on this table: 'It appears that the evaporation from the surface of the ground in the valley of Long Pond was about 44 per cent more in 1838 than it was in 1837, while the ratio of the drainage differed less than one per cent the same years.' "Dr. Hale states the evaporation from water-surface at Boston to be 56 inches in a year. (Senate Doc., No. 70, for 1853.) "The following table contains the results arrived at by Mr. Coffin, at Ogdensburgh, and Mr. Conkey, at Syracuse, in regard to the evaporation from water-surface: