File:The fireside university of modern invention, discovery, industry and art for home circle study and entertainment (1902) (14592466840).jpg

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Identifier: firesideuniversi01mcgo (find matches)
Title: The fireside university of modern invention, discovery, industry and art for home circle study and entertainment
Year: 1902 (1900s)
Authors: McGovern, John. (from old catalog)
Subjects: Science
Publisher: Chicago, Union pub. house
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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Fig. 80. CHRISTOMANNS APPARATUS FOR DISCOVERING THE MELTING-POINT, WITH ELECTRIC SIGNAL. Elements must be heated, as we say, more or less to turn theminto fluids. Give me an idea of the use to zvhich the Elements are put innature ? The Air consists mainly of Oxygen and Nitrogen, and thisenvelope surrounds the earth to a great distance. The Wateris mainly Hydrogen and Oxygen. The solid earth is mainlyOxygen, Silicon, Carbon, Calcium, Magnesium, Aluminium,Iron and Potassium—that is, far greater quantities of these thanof any other Elements could be contracted for, to be deliveredon another world. They wo»M be found in quartz, silica,limestone, clay and felspar.
Text Appearing After Image:
Fig. 81. HUMBOLDT IN HIS STUDY. CHEMISTRY. 229 What Elements must animals and plants have ? The only absolutely necessary ones appear to be Carbon,Oxygen, Hydrogen, Nitrogen, Sulphur, Phosphorus, Calcium,Iron, Potassium, Sodium, Chlorine, Silicon and Magnesium. What is the chemical difference betweenplants and animals ? Animals have Nitrogen in addition to theleading Elements that the plants have.Plants breathe out Oxygen; animals takeit up. Animals breathe out Carbon ;plants take it up. The refreshment feltin the woods and fields is probably due tothe great supply of Oxygen that is offeredto the lungs of animals whose supplies mayhave been scantier. How are Elements compared scientifi-cally ? By extending them into gases, weighingthem, noting the amount of heat theyhave taken up, and measuring the volumeinto which they have expanded. It is alsoimportant that the electric condition of theElement should be noted, and it is thereforeput between the poles of a battery whereit seeks one o

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Author McGovern, John. [from old catalog]
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Flickr tags
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  • bookid:firesideuniversi01mcgo
  • bookyear:1902
  • bookdecade:1900
  • bookcentury:1900
  • bookauthor:McGovern__John___from_old_catalog_
  • booksubject:Science
  • bookpublisher:Chicago__Union_pub__house
  • bookcontributor:The_Library_of_Congress
  • booksponsor:The_Library_of_Congress
  • bookleafnumber:259
  • bookcollection:library_of_congress
  • bookcollection:americana
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29 July 2014
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