расширенный поиск

Книга: Creative Chemistry

Товар № 10201012
Автор: Edwin E. Slosson
Вес: 0.230 кг.
Год издания: 2010
Страниц: 150 Переплет: Мягкая обложка
Товар отсутствует
Узнать о поступлении

Purchase of this book includes free trial access to million-books where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: SYNTHETIC PERFUMES AND FLAVORS The primitive man got his living out of such wild plants and animals as he could find. Next he, or more likely his wife, began to cultivate the plants and tame the animals so as to insure a constant supply. This was the first step toward civilization, for when men had to settle down in a community (civitas) they had to ameliorate their manners and make laws protecting land and property. In this settled and orderly life the plants and animals improved as well as man and returned a hundredfold for the pains that their master had taken in their training. But still man was dependent upon the chance bounties of nature. He could select, but he could not invent. He could cultivate, but he could not create. If he wanted sugar he had to send to the West Indies. If he wanted spices he had to send to the East Indies. If he wanted indigo he had to send to India. If he wanted a febrifuge he had to send to Peru. If he wanted a fertilizer he had to send to Chile. If he wanted rubber he had to send to the Congo. If he wanted rubies he had to send to Mandalay. If he wanted otto of roses he had to send to Turkey. Man was not yet master of his environment. This period of cultivation, the second stage of civilization, began before the dawn of history and lasted until recent times. We might almost say up to the twentieth century, for it was not until the fundamental laws of heredity were discovered that man could originate new species of plants and animals according to a predetermined plan by combining such characteristics as he desired to perpetuate. And it was not until the fundamental laws of chemistry were discovered that man could originate new compounds more suitable to his purpose than any to be found in nature. Since the progress of mankind is continuous...

Читать далее