. Adventures with animals and plants. Biology. Biologists Study Anivials a?id Plants do not yet know how these types of penicilhn differ or what the chemical make-up of penicilhn is. By the time you read this it is likely that much more will be known about this spectacular drug. The problem of cancer is of tremen- dous interest to men and women. How can we detect it as soon as it starts so that we can save a human life? What causes it? Do we know exactly how such organs as the liver and the spleen function in man? How do vitamins act to prevent certain diseases? Is "intelli- gence" —
. Adventures with animals and plants. Biology. Biologists Study Anivials a?id Plants do not yet know how these types of penicilhn differ or what the chemical make-up of penicilhn is. By the time you read this it is likely that much more will be known about this spectacular drug. The problem of cancer is of tremen- dous interest to men and women. How can we detect it as soon as it starts so that we can save a human life? What causes it? Do we know exactly how such organs as the liver and the spleen function in man? How do vitamins act to prevent certain diseases? Is "intelli- gence" — whatever it is — inherited? If so, how? If not, what produces it? What can we do to improve it in boys and girls? What makes us act as we do? And basic to all these questions: What kind of material is the living stuff in all plants and animals? Will we ever be able to make such living stuff in the laboratory? There are thousands of such questions that can be asked, and, fortunately, there are thousands of men and women in every country trying to answer them. The most fascinating part of the study of biology is that at any moment a com- plete or a partial answer to a problem may be provided. When you read this book you may know the answer to a question that the authors did not know when they wrote it. The pursuit of biological knowledge goes on always with continuing success. In UNIT I you "will consider these problems: Problem i . \\^hat Kinds of Animals Inhabit the Earth? Problem 2. What Kinds of Plants Inhabit the Earth? Problem 3. How Are Living Things Named and Classified?. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Kroeber, Elsbeth, 1882-; Wolff, Walter Harold, 1901-. Boston : D. C. Heath
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