Adventures with animals and plants (1948) (17751511050)

Title: Adventures with animals and plants

Identifier: adventureswithan00kroe (find matches)

Year: 1948 (1940s)

Authors: Kroeber, Elsbeth, 1882-; Wolff, Walter Harold, 1901-

Subjects: Biology

Publisher: Boston : D. C. Heath

Contributing Library: MBLWHOI Library

Digitizing Sponsor: MBLWHOI Library

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Biologists Study Anivials and Plmts Fig. 7 A corner of the Boy Scout Museum at Bear Mountain, New York. What suggestiotis for hobbies does this picture give you? (AMERICAN MUSEUM OF NAT- URAL history)

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scientist. The well-equipped workshop has sinks with faucets of different sizes; stone tables with vacuum and air pres- sure outlets and connections for gas and electricity; rows of shelves for bot- tles of dyes, acids, testing agents, glass- ware of many kinds, and some reference books; cupboards with microscopes, dissectingr instruments and other instru- ments of various sorts. There may be an incubator, a pressure cooker, a refrig- erator. The laboratory is the place in which biologists perform their "labors," in which they investigate, observe, ex- periment, draw conclusions, and record their studies of living things. That is why boys and girls who set up little places at home for the study of living things may speak of them as biologists' workshops or laboratories. A peep into a laboratory. The great Russian biologist, Ivan Pavlov (1849- 1936), in the early years of the present century wished to learn something of animal behavior. Let us visit him in his laboratory. He used dogs as experimental animals because they M^ere easy to work with. Pavlov wanted to find out how the saliva can be made to flow in a dog. But before he could begin his experiment he had to perform a difficult operation. He opened a small hole in the dog's face and inserted a tube to which a jar was attached. When Pavlov showed food to the dog, the saliva flowed into the jar and the amount could be measured. It took weeks to train the do^- to stand still in a harness while he was fed. After these preparations Pavlov was ready for his experiment. He rang a bell each time he put food before the doer. This was continued for some time. Then, one day, Pavlov rang the bell without putting the food before the

adventures with animals and plants 1948 Bärengebirgsstaatspark Buchillustrationen Botanik Gartenbau Landwirtschaft Elektrizität Elektrotechnik Zoologie Tiere und Pflanzen Biologie Bilder aus dem Internetarchiv

1948

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