Theodore F. Niehaus's A Field Guide to Southwestern and Texas Wildflowers PDF

By Theodore F. Niehaus

ISBN-10: 0395936128

ISBN-13: 9780395936122

Этот справочник охватывает 1505 видов дикорастущих цветов, группируя их по окраске и внешнему виду для облегчения сопоставления растений и их изображений. Книга содержит более 1500 иллюстраций.
Доп. информация: Файл является рипом с сайта Google Books. Этим определяется отсутствие некоторых страниц (до 20% от общего числа) и невысокое разрешение сканирования (около a hundred dpi).

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Sample text

Unfortunately, he, also, was the victim of the primitive state of knowledge of the natural world at the time. As the elements water and earth were thought to be the only sources of bulk, it followed that if earth (soil) was not the source of the gain in weight of the willow, then it had to be the water added, since the elements air and fire had no weight. As we shall see later, van Helmont was not wrong in saying that water contributed to the weight gain by his willow tree. His mistake was thinking that water was the main origin of it.

The only molecule which can pass across this barrier freely in both directions is water. The strong solution of salts and other soluble compounds contained within the living cell is held in by the membrane barrier and allowed to move out only very slowly. This strong solution inside a living cell attracts water from the surroundings. This is osmosis; the attraction of water across a controlling barrier, such as a living cell membrane, in the direction of a strong solution of salts and other dissolved substances.

Combustion, or burning, was a topic that had intrigued alchemists for centuries, especially how one chemical compound could be transmuted into another by heat. The age-old search by alchemists for the formulae Page 19 to transmute baser metals into gold and for the elixir of life were manifestations of the fascination they had with the effects of combustion on substances. Modern-day industries based on the purification of metals and their fusion together by heating to form alloys are outgrowths of the activities of these alchemists.

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A Field Guide to Southwestern and Texas Wildflowers by Theodore F. Niehaus


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