 | George Perkins Marsh - Conservation of natural resources - 1864 - 592 pages
...intercept a great proportion of the pernicious exhalations." $ Lieutenant Maury even believed that a few rows of sunflowers, planted between the Washington Observatory and the marshy banks of the Potomac, had saved the inmates of that establishment from the intermittent fevers to which they had been formerly... | |
 | Education, Higher - 1870 - 816 pages
...thus intercept a great proportion ofthe pernicions exhalations. Lieut. Maury believes that a free use of sunflowers, planted between the Washington Observatory and the marshy banks of the Potomac, has saved the inmates of that establishment from the attacks of intermittent fevers to which they have... | |
 | George Perkins Marsh - Conservation of natural resources - 1874 - 702 pages
...localities, and thus intercept a great proportion of the pernicious exhalations." f Maury believed that a few rows of sunflowers, planted between the Washington Observatory and the marshy banks of the Potomac, had saved the inmates of that establishment from the intermittent fevers to which they had been formerly... | |
 | George Barrell Emerson - Shrubs - 1875 - 534 pages
...influences is very general among Italians best qualified to judge upon the subject." " Maury believed that a few rows of sunflowers, planted between the Washington observatory and the marshy banks of the Potomac, had saved the 1 SCHARTZ, Let Arbret, as quoted by Marsh. inmates of that establishment from the intermittent... | |
 | Literary and Philosophical Society of Liverpool - 1879 - 376 pages
...most violent torrential floods after the destruction of the woods of its basin between 1828 and 1838, but has now been completely subdued and its waters...from wind. Becquerel found that in the valley of the Rhone, a simple hedge two metres in height was a sufficient protection from cold winds for a distance... | |
 | Literary and Philosophical Society of Liverpool - 1879 - 388 pages
...since the destruction of these woods it has become a malarious region of pools and marshes. In Sologue, the same cause has withdrawn a million of acres of...from wind. Becquerel found that in the valley of the Rhone, a simple hedge two metres in height was a sufficient protection from cold winds for a distance... | |
 | Literary and Philosophical Society of Liverpool - 1879 - 376 pages
...Carolinas are healthy, even to the white man, so long as the forests in and around them remain, hut become very insalubrious when the woods are felled....from wind. Becquerel found that in the valley of the Rhone, a simple hedge two metres in height was a sufficient protection from cold winds for a distance... | |
 | Maine. Board of Agriculture - Agriculture - 1865 - 442 pages
...thus intercept a great proportion of the pernicious exhalations." Lieutenant Maury even believed that a few rows of sunflowers, planted between the Washington Observatory and the marshy banks of the Potomac, had saved the inmates of that establishment from the intermittent fevers to which they had been formerly... | |
 | George Perkins Marsh - Human geography - 1882 - 720 pages
...localities, and thus intercept a great proportion of the pernicious exhalations." f Maury believed that a few rows of sunflowers, planted between the Washington Observatory and the marshy lj;mks of the Potomac, had saved the inmates of that establishment from the intermittent fevers to... | |
 | Massachusetts Horticultural Society - Agriculture - 1885 - 800 pages
...malarious influences, is very common among Italians. Lieut. Maury stated that he believed that a few sunflowers planted between the Washington Observatory...the marshy banks of the Potomac saved the inmates of the Observatory from intermittent fevers, to which they were subject before the planting of the sunflowers.... | |
| |
Sologne, the same cause has withdrawn a million of acres of ground from cultivation which were once well-wooded and productive. Beyond their water-regulating use, trees would seem to have, in common with some other plants, a direct beneficial effect upon... 
