Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 518
that altitude, about 13,000feet, would become very ill through the changein the air-pressure. Yes, most people would become ill if theyclimbed up, but not if they were carried up. Itis not only the rarefied air that affects them,but the exertion of the climb uses up theoxygen in the blood, and that… … DIAGRAM OF THE PROPOSED JUNGFRAU RAILROAD. No, said Uncle Tom ; we can only rea-son it out; a very ingenious experiment hasbeen made with guinea-pigs. With guinea-pigs! called out little May. Is nt that funny ? Then Uncle Tom told the children howscientific men had proved by means of animalsthat…
Children's literature
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