. Adventures with animals and plants. Biology. 12. Biologists Study Animals and Plants Fig. 11 Dr. Alexander Flem- ing in his laboratory, exam- ining some mold cultures in test tubes. You ivill read 7/iore abo2it his great con- tribution to the world. He discovered the drug, peni- cillin, (wide world) Ultraviolet and electron microscopes. In using the ordinary microscope we use light that the eye can see. A little over forty years ago it was discovered that one could obtain higher magnifica- tion by using ultraviolet light. Ultra- violet light cannot be seen by the human eye but can be photogr
. Adventures with animals and plants. Biology. 12. Biologists Study Animals and Plants Fig. 11 Dr. Alexander Flem- ing in his laboratory, exam- ining some mold cultures in test tubes. You ivill read 7/iore abo2it his great con- tribution to the world. He discovered the drug, peni- cillin, (wide world) Ultraviolet and electron microscopes. In using the ordinary microscope we use light that the eye can see. A little over forty years ago it was discovered that one could obtain higher magnifica- tion by using ultraviolet light. Ultra- violet light cannot be seen by the human eye but can be photographed. By this means magnifications of 4000 or even higher are possible. Objects that had been invisible under the best microscope could now be seen. More recently an electron microscope based on new prin- ciples has been invented. Recent im- provements have given us a microscope that magnifies 20,000 times. Then by enlarging the negatives a magnification of about 200,000 times can be obtained! In just a few years biologists have suc- ceeded in photographing objects that no one had ever hoped to see. You may expect the newspapers and magazines to carry exciting accounts of new discov- eries in the future as the electron micro- scope is applied to living things and new facts are learned about their tiniest parts. The study of living things goes on. All the world over there are biologists, both men and women, as well as boys and girls, who continue to study living things. Their activities are as varied as the activities of the living things that they study. There are so many problems to study — there is so much we do not yet know — that biological study is end- less and always fascinating. A glance at the newspaper will dis- close the fact that discoveries are being made daily. As this is written it is knowxi that there are four or more kinds of penicillin made by mold plants. They have been used successfully to combat certain types of disease germs. But we. Please note that
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Keywords: ., bookcentury1900, bookpublisherbostondcheath, booksubjectbiology
