 ... gradually formed in which all kinds of plants grow with the greatest luxuriance. This fertility is owing to the alkalies which are contained in the lava, and which by exposure to the weather are rendered capable of being absorbed by plants. Thousands...  Report of the Secretary of Agriculture ... - Page 23by United States. Department of Agriculture - 1865Full view - About this book
 | United States. Patent Office - 1852 - 854 pages
...rendered capable of being absorbed by plants. Thousands of years have been necessary to convert stones and rocks into the soil of arable land, and thousands of years more •will be required for their perfect reduction — that is, for the complete exhaustion of their alkalies. Air, water, and the change... | |
 | washington: Government Printing Officee - 1865 - 778 pages
...is remarked by Liebig that " thousands of years have been necessary to convert stones and rocks iuto the soil of arable land, and thousands of years more...would be variations, as a member of the series in oiie line might thin out, or be wanting on another line, yet the same general ft-atures would prevail.... | |
 | 1885 - 668 pages
...rendered capable of being absorbed by plants. Thousands of years have been necessary to convert stones and rocks into the soil of arable land, and thousands of years more will be requisite for their perfect reduction, that is, for the complete exhaustion of their alkalies. We see... | |
 | William Blackwood - 1842 - 606 pages
...to its absorption by the roots of plants. " THbusands of years have been necessary to convert stones and rocks into the soil of arable land, and thousands of years more will be requisite for their perfect reduction, — that is, for the complete exhaustion of their alkalies."... | |
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