It seems to be now conceded that the chief value of the Euca-Ipytus resides in its rapid growing and numerous roots, which absorb so much moisture as really to dry up ground but moderately marshy, and indeed to prevent in this way the material action on animal life. As the tree cannot be grown where the thermometer shows a lower temperature than the freezing point, we might at least profit by the hint to the extent of extensive planting of other fast growing trees in marshy places that have an unhealthy reputation. We fancy a grove of cypress would be as health giving as though of Eucalyptus.