 | 1832 - 852 str.
...stratum of this fine dust mixed with scoriae is an excellent non-conductor of heat, and might he thinks have preserved the snow from complete fusion when...shepherds in the higher regions of Etna are accustomed to keep an annual store of snow, by simply strewing over it a layer of volcanic sand a few inches thick,... | |
 | 1831 - 602 str.
...before the descent of the lava. A dense stratum of this fine dust mixed with scoriae is well known to be an excellent non-conductor of heat, and may thus have...higher regions of Etna are accustomed to provide an annular store of snow to supply their flocks with water in the summer months, by simply strewing over... | |
 | 1831 - 460 str.
...before the descent of the lava. A dense stratum of this fine dust mixed with scoria; is well known to be an excellent nonconductor of heat, and may thus have...strewing over the snow in the spring a layer of volcanic aand a few inches thick, which effectually prevents the sun from penetrating. When lava had once consolidated... | |
 | 1831 - 644 str.
...stratum of this fine dust mixed with scoriœ is an excellent non-conductor of heat, and might, be thinks, have preserved the snow from complete fusion when...shepherds in the higher regions of Etna are accustomed to keep an annual store of snow, by simply strewing over it a layer of volcanick sand a few inches thick,... | |
 | Sir Charles Lyell - 1832 - 634 str.
...stratum of this fine dust mixed with scoria; is well known to be an excellent non-conductor of heat; and the shepherds in the higher regions of Etna are accustomed to provide water for their flocks during summer, by strewing a layer of volcanic sand a few inches thick over... | |
 | 1833 - 540 str.
...stratum of this fine dust, mixed with scoria', is well known to he an excellent non-conductor of heat : the shepherds in the higher regions of /Etna are accustomed to provide water for their flocks during summer, by strewing a layer of volcanic sand a few inches thick over... | |
 | 1833 - 1092 str.
...stratum of this fine dust, mixed with scoriae, is well known to be an excellent non-conductor of boat : the shepherds in the higher regions of ./Etna are accustomed to provide water for their Hocks during summet, by strewing a layer of volcanic sand a few inches thick over the... | |
 | David Purdie Thomson - 1849 - 516 str.
...stratum of this fine dust mixed with scoriae, is well known to bean extremely bad conductor of heat ; and the shepherds in the higher regions of Etna are accustomed to provide water lor their flocks during summer, by strewing a layer of volcanic sand a few inches thick over... | |
 | George Dennis - 1864 - 828 str.
...stratum of this fine dust mixed with scoriœ is well known to be an extremely bad conductor of heat; and the shepherds in the higher regions of Etna are accustomed to provide water for their flocks during summer, by strewing a layer of volcanic sand a few inches thick over... | |
 | Sir Charles Lyell - 1990 - 594 str.
...the descent of the lava. A dense stratum of this fine dust mixed •with scoriae is well known to be an excellent non-conductor of heat, and may thus have...store of snow to supply their flocks with water in VOLCANIC ERUPTIONS IN ICELAND. 371 the summer months, by simply strewing over the snow in the spring... | |
| |
... this locality. We may suppose, that, at the commencement of the eruption, a deep mass of drift snow had been covered by volcanic sand showered down upon it before the descent of the lava. A dense stratum of this fine dust mixed with scoriae is... 